Eren is not in love with Historia. It is true that he cares a lot about her, but no evidence as of right now suggests that he is in love with her. Eren's feelings for her are not portrayed as romantic and the same goes for Historia. She is not in love with Eren, although she greatly admires and respects him.
At the Animagic 2014 series panel, producer George Wada confirmed that Ymir and Historia are "indeed a couple", which confirms that Historia in fact has romantic feelings for Ymir. When she was still acting as Krista, Eren secretly disliked her and she envied him for having clear goals.
In AOTNR, Historia agrees to keep quiet about Eren's plan, but not for ambiguous reasons like in the original story, but only after Eren promises to come back alive to Paradis. In this version, Eren and Historia do have a romantic relationship and he becomes the father of her child.
By telling Floch and Historia his plans, Eren was able to spread word of his intentions. By impregnating Historia, he would protect her and eradicate the Curse of Ymir.
In the Junior High anime it is heavily implied that Annie has a crush on Eren and the two of them bond over their shared love for cheese burger steak.
Put simply, Season-3-Eren saw Season-4-Eren in Grisha's memory, and through Grisha's memory, he saw Future Eren's plan. Effectively, when Season-3-Eren kissed Historia's hand, he saw his entire future.
Most believed it was the farmer as the Military Police stated, meanwhile the other half believed Eren Jaeger was the father. However, in Chapter 139 the theory was debunked and the Farmer was confirmed the father of Historia's baby.
Levi is the brother of Mikasa. Hughes is the father of Levi. Victoria is the daughter of Christa.
He does love Mikasa but is only able to confess this at the end of Attack on Titan. In chapter 139, the protagonist has a heart-to-heart with Armin, in which he expresses disappointment at the thought of Mikasa finding love with someone else after his death.
Canon. Historia and Reiner didn't seem to be very close, but Reiner seemed to have an interest for her since season one in the anime and the manga. He brought up multiple times how he wanted to marry her; the first time was when Reiner, Jean, and Armin escaped from the Female Titan's grasp.
Eren kissing Historia's hand is one of the most important scenes in the manga in terms of the plot. Eren was really horrified not only about the fact that he is the main cause of the death of the entire royal family, but also about other events that will happen in the future which are represented as the memory shards.
Eren and Historia could get married because, for real, Historia is the only other person whom he treats like Armin and Mikasa. In the distress ova he's the only one whom mentions to rescue krista. He also the one whom said he likes her now and admires her bravery. Well might be, because Eren is about to die.
Eren Yeager - After hearing from Zeke about the existence of his half brother Eren, Yelena harbored a desire to see him due to holding more than one Titan ability, including that of the Founding Titan.
According to the Attack on Titan Fandom, Historia gets pregnant to protect the island of Paradis. She was instructed to eat Zeke Jaeger, the current holder of the Beast Titan, so she would inherit the ability from him and be able to pass it along to her children.
While there are many characters that he respects, Erwin Smith is perhaps the only character that Captain Levi has truly loved, which puts Erwin at the very top of the list. Levi's loyalty and devotion to Erwin also indicate that the two were meant to be together.
Several other characters refer to Eren as Mikasa's boyfriend, and though she protests, she usually blushes at this suggestion. When Mikasa thinks Eren is dead, she nearly commits suicide by throwing herself at a Titan. When Eren is inside a Titan, Armin can't bring him back to reality until Eren remembers Mikasa.
Annie still questions him on his feelings and Armin asks her if she still doesn't get that he is in love with her despite how much Hitch teases him about it, to which Annie tries to deny understanding but reveals she has also started blushing implying she does indeed know and shares mutual romantic feelings for him too ...
There even are fans theorizing the man is actually Armin, while others say the woman isn't Mikasa. Until Isaya doesn't confirm anything, there's no way to know if Mikasa married Jean, Armin, or some complete stranger. The most accepted theory, which is practically confirmed, is that she ends up alone.
Eren is a young man of average height and muscular build. He has a fairly long, yet rounded face, and sizable, expressive, teal-green eyes.
Eren needs someone who is kind and patient, first and foremost. He needs someone who can help bring the edge off whenever he's immensely stressed (because this kid has a lot of weight on his shoulders ok) and that can be patient when he might become too irritated or quick to snap.
Another factor that has led fans to believe Eren is the father is the timeline between his mission to Marley and the start of Historia's pregnancy. Eren would leave for Marley shortly after Historia got pregnant; 10 months later, she would give birth during Eren's rumbling.
With this in mind, Eren's laughter becomes something much more ominous. It becomes a sign of not only despair at losing Sasha but his resignation to the future. Sasha's death may have been the thing that drove Eren over the edge, forcing him to confront the absurdity of resisting his fate.
Is Historia in love with Ymir? Yes.
Eren Wouldn't Be On A Rampage
The easiest thing to decipher from this hypothetical scenario is that Eren wouldn't be on his current rampage, mostly because he never would have had the power of the Founding Titan to begin with.