I can't get it together!

This  is my first post. I cannot get over my break up with my boyfriend, we broke up officially my found out he was cheating on me right before Christmas. But the thing is we were together for  16 years three years ago we broke up, was not the best relationship he cheated on me quite a few times, when we broke up I blocked him it took me forever to get over him it was tough , He texted me I would ignore it finally one night he texted me two years ago I answered it and it going back to him he was with another woman while I was with him I was ready to walk away he finally broke up with her we were together I was never so happy in my life we had so much fun  we did things we never did in our 16 years prior relationship we were thinking about buying a house we were just so happy I thought and then slammed again he was cheating on me, I am devastated  I am trying to get over it and for some reason I can't I think of him 24 seven I wake up and I have dreams about him and I don't know what this is I just want to get rid of it I want to get rid of his thoughts in this pain that I'm feeling , i'm lonely I'm sad I have anxiety I don't feel like I could keep going on like this ...is anybody else feeling this way, I want to feel better now!!!