I was goimg out with my boyfriend who was 20 and I am 24 for a month n a half and then he broke up with me. In the beginning everything was great he was doting and attentive then he got a new job and overnight his whole personality had changed he turned really arrogant and cocky and wouldn't really talk to me and kind of pulled away. I gave him space and everything he wanted but he still broke up with me, I feel like it was me and I have done something wrong, I am still hurting and miss him and don't know what tp dp I would really like some advice.

He was most probably using , I am guessing to buy him stuff that he didn't have the money for at that time

I think you are searching for a closure that doesn't really matter... you still need to learn to forgive yourself, as you seem to blame this on yourself, which isn't fair to you. His actions don't let yourself esteem off the hook. Create your own closure, and move on.

Your closure is that he ended it, you don't need him in your life anymore

You tried, but it didn't work and the reasons it didn't don't really matter. What does matter is healing from your loss, and getting on with your life.

Don't take it personally, you were just being yourself, and it didn't work out.