Yeah, in the movie, Peter's depression was so bad that he was willing to die a slow and painful death in Miles' universe, because he had nothing left back in his. I really hope things worked out between him and MJ and maybe they had a kid.
yeah and i picture both of them somehow traveling to miles universe and his kid being like “omg you’re miles!?!?! my dad talks about you all the time!!!!!” and miles just immediately adopting the role of big brother and loving this kid