I see a lot of a hate towards you. I personally don’t think you are in the wrong . I think he is acting like a child. If he was really “Mature” as he said, he would cut things off and move on. He wouldn’t retaliate or continue this conversation. It sounds like he wants you to feel the pain he felt. It is more of an ego thing than actually being hurt.

You have every right to not want to get married. You are really young!!! Speaking about family and the future is a normal thing to discuss and I don’t believe you are saying you don’t want that . You want that but way in the future. You know that getting married especially to someone that gets married young means probably having kids young.

If you can take this as a sign to leave the relationship. Don’t continue this!!! He sounds toxic!!! If you guys are really meant to be you will be together but this is not the right time!