Sad about breakup with ex but it's been months?

My ex boyfriend broke up with me in September after we went on a "break". Then he started dating his best friend. I am still pretty much heartbroken and this led me to do not so good things. I started making myself throw up after eating and becoming very impulsive. Me and him kinda sorta did stuff behind his current Girlfriends back too... I'm not going into detail but I feel so guilty and disgusting. A couple weeks ago he said this is the last time we will ever see each other and he kissed me. I feel disgusting and guilty and used and horrible. He told me that he should've never let me go and that I should've convinced him to stay. How do I recover from this heartbreak? We dated for a year by the way. I just can't believe he threw a year away for her when she barely helps him and isn't a very good girlfriend. then he came to me for weeks and I actually did that out of loneliness but now I regret it..
Sad about breakup with ex but it's been months?
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