Heart Broken---help!

Hello,

i guess I just wanted to talk to someone. Last night my boyfriend of almost 3 year broke up with me and I feel devastated. I think about him all the time and I just feel so much pain right now. I love him so much and last night he told me he still loved me but that it just wasn't the same anymore, he thought it was time to let go. This past year has been really rocky for us, we've been on and off a lot but only a few days go by before we get back together. I blame all this on his insecurity, he doesn't trust me at all but i've never given him a reason not to trust me. He is very possessive of me, but it doesn't bother me because I have nothing to hide from him. I've told him this and i'm always complementing him, telling how much he means to me, how much I love him but still this isn't enough. Arguing in our relationship doesn't exist because instead of doing any arguing he will just break up with me for the dumbest reasons. And every time that happens I talk to him about it and we end up working things out. This time it's different though, he seemed like he had really made up his mind last night. I'm tired of trying and tired of hurting but I really don't want to loose him. I am so confused right now, I know I want to be with him but I don't know if maybe this time I should just let him be. No calls, no seeing him, no nothing, just giving him some space so that he figures out what he wants. Im just so afraid that if I do this, he will not come back. I keep hoping that if I give him this "space" he will realize that we are great together. We've talked about our future together and we both want it so bad but then the next minute he tells me that I would be better off without him, that I could do so much better, that I will meet someone great but I don't want anyone else, I love him, I choose him and I tell him this every time but he doesn't listen. Any advise/opinions, what do I do? How do I keep myself from not calling him? How do I help him get over this? Thanks!