Cheating ex boyfriend. Help?

So this guy dated me for an year and even proposed marriage to me. One day in found it he was talking to this other chick. I called him out on it and he refused point black. He gave a big speech on my trust issues. Anyway I broke up with him. This was like 2 weeks back. Today I found a picture of him and this girl holding hands on her Facebook profile pic. I am so disgusted. I feel like confronting him. Should I or should I just let it be
Confront him
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Let it go
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Cheating ex boyfriend. Help?
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