Bucky

You used to be Bucky's girlfriend after he got re-instored in society. After a year of relation, you learn that he was using you to get better after all his trauma (he didn't loved you) so you left him and the Avenger (you were a super hero too) without knowing you were pregnant with his child. It's been 4-5 years now and you got captured by a vilan who's asking for a ransom. (all the Avenger are present and none of them is die)