What should I do after my first break up? How do I deal with it...

My boyfriend broke up with me a couple or so months ago. I’m 19 and we went out for almost two years, he was my first and now I don’t know what to do. During the relationship I paid for nearly everything, and sometimes he would ask me to buy something for him and i would. I always made the first move…called him and he hardly called me. last few months of our relationship or the beginning of this year we began to fight a lot and he would act arrogant, I would cry and he would ignore and sometimes i would try and push him away aggressively. I think after a while he was pushed away but he still kept asking me to buy things, never paid for anything…even on my birthday, made a lot of excuses to me, to me, it seemed he was treating his friends better. He would say nice things to me but behind my back would say i was clingy…after everything I was really really hurt. The night before we broke up he wanted to bleach his hair, i paid for that and lunch because he ‘never has money’ then that night i found some sought of porn on his iphone and i just felt hurt…i always initiate everything, did a lot for him. in the morning i felt worse, he acted arogant again and i threw the bottle of bleach at him and kicked him really hard. later he sends me a text to break up, avoids my phone calls and a week later i send him a text he said he has already moved on… i dont understand and it really hurts…will he regret breaking up with me? should i truly move on now? he still has my bestfriends guitar he wouldnt bring that back when we asked. whats going on? my bestfriend also thinks nothing big happened between us and he did not need to break up with me. I don’t drink, i don’t go clubbing, I’m a very quiet person…he said he would still want me in his life…but every thing he has ever said to me, I don’t believe or trust his word.