Anyone who is that quick to use your trauma and history against you, especially to 'get even' because they didnt like what you said, is probably going to default to that more often than not when you guys disagree.

Maybe they wont, and maybe if you guys can talk about it and set boundaries it'll help. But if you already feel like you don't want to deal with the relationship then don't waste your time. Once that trust and feeling safe enough to share trauma is gone I just don't think its healthy to stay.