What makes a guy gain maturity to be in a real relationship

So this guy and I were talking and really liked each other in the fall but than had miscommunication that turned into fighting which ended up causing us to have no contact for months. This was partially my fault on not being the best at communicating. But than he got a girlfriend during the two months we didn’t see each other & I think he began dating her because he truly wasn’t interested in me after the fighting and liked her. But than after winter break I started seeing him out and around all the time and he would desperately try to talk to me, hey my attention, and ignore her for me all the time. If he’s treating her like this, would he end up treating me the same?? Is this something he needs to grow up from doing on his own

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