Is this my fault?

Well my boyf was at college today, and he rang me around 12ish and I said too him ‘have you spoke too any girls today’ he said no not really, and then I said what do you mean not really, you either have or you aint, and he was like well I was sat next too this girl in ict and she added herself onto my facebook, I was like so why didnt you delete her? And he said because she’s a mate, then I said well if you dont delete her then its over between me and you because he promised me he wouldn’t add any girls in 4-5 months because he knows how worried I get because I’ve been cheated on all my life, and he knows im even more worried when hes at college, but no he wouldn’t delete her, I was crying in the middle of town for nearly an hour, he said he didnt care hes guna add who he wants and all this, so I said okay keep her but I dont want you winking at her or anything, he said okay, so that was all sorted, then he told me he spoke to some girl last week and was talking to her the whole lesson about me, saying I control him I dont let him do anything, I asked him did he speak 2 any girls, he said no, but then I got home because I was in town at the time, and the girl that added herself from the ict clas she accepted him, and then I added her, just to be friendly to see what shes like and that, then I told him and he went mental, he was shouting and swearing saying oh im guna add al your girl mates now and all this, saying oh you ruin my life you never let me have friends, your guna make her hate me, I said 2 him I was like you aint hiding nothing so why cant I add her, and he just said oh I want you out my life its over dont speak too me again and hung up, now his phones off and its over between me and him, we’ve been together nearly 15 months and he chucked it away because I added one of his girl mates hes known less than a week.

I have got told oh I’ve gotta let him talk to girls and that, and I do he can talk to them, add them, the lot, but he promised he wouldn’t for itleast 4-5 months because he knows how worried I am, I’ve sat there and cryed my eyes out, all the time infront of him, begging him not 2 hurt me so he knows how worried I am, its just the fact I added her to be friendly and he doesnt like it and has finished me because of it? Is this my fault, I duno what to do anymore?