Miscarriage at 15

I was dating this guy (J) for 15 months.. we tried to have a baby but i miscarried, he was abusive tho...... years later we’re both 18. I have a baby w somebody else but he’s out of the picture and we (me n J) are low key talking again, not flirting but just talking... I mean idk if it’s flirting he said I looked nice the other day.. am i dumb? could there be a possibility he ‘changed’??

One time when I was breaking up with him he brought up the fact that we have a child in heaven 😣