Reintroducing an ex from 2013/14

This dude was my first love & first everything. We dated for about 2 years but I broke up w him because I was insecure. However, my mom loved him. I don’t think she does anymore. She has called him crazy when I mentioned him but when we first broke up, she pretty much blamed me for the breakup & called me dumb for letting him go. We’re kind of talking again & idk how to introduce him again. I’m hesitant. He’s leaving to the marines in July so it’s making me rethink if it’d even be worth it /: we haven’t talked in so long so I feel that he should meet the new me while I meet the new him as well but I’m 17 (18 soon) so I can’t just go out with him on dates without permission. I don’t want to date him if he’s a completely different person (negatively) so I want to take the time to meet him again & im wondering if it’ll be enough time from here on to July. Help?

For clarification, I know he’ll be different but I meant that I wouldn’t date him if he was a bad different, like selfish, mean, rude, conceited, etc .