How do I go on?

I just got out of a 2yr relationship about a month ago, but the pain is still there. I found out that my b/f had cheated on me not once, but three times, and he masturbated while talking and camming with other women. This hurts so much because I invested so much of my love and time into him and the relationship. I feel betrayed. He said that he was angry at me at the time, and understands my feelings about this and has apologized but says that if I wanted to get back to him that I would have to apologize to him and prove my love to him because he has been trying to get me back for the past month. WTF??? How do I get over this, move on and forget about him? I admit that I still love him, but can't go back to him. The love is tainted in my eyes. What do I do?