Boyfriend problems

It sounds a bit like he's ready to move on from your relationship. If he's admitting to being too immature, then at least he's (ironically) mature enough to own up to it. Like you said, he's your first which will make him a significant person in your tale, but it doesn't mean that it has to so bad. It isn't the best time to break up, but you will have the whole summer to get over him and have fun. Become an individual again and enjoy things without him because it does sound like he's ready to break up with you.

Yeh, It would just hurt seeing him with other girls/getting with other people, I don't know whether he wants to be single because he cant deal with the burden of a relationship, or to hes not ready to commit to one person, and still wants to be with the other girls? Thats what has hurt me the most, it was also my 18th birthday all of these happened, not great.

Being a person who had been dumped at a pretty crucial time, I cans sympathise that his timing will make it feel worse. But then again, it was your 18th and he couldn't even make it happy for that one night? It will suck, I won't lie to you there. But would you really want to stay with him with all these doubts and (what sounds like) a lack of committment from him? My advice would be to accept it if he does break up with you. If you are meant to be, you will be. Maybe now isn't the time for you two though.