Damn! That is a VERY confusing situation.
In my opinion, I've always gone with the phrase.. "Once a cheater, always a cheater." He may say he'll never do it again, but he's already shown that he might do it. The only thing that stopped him was the friend of yours. He got caught, so he'll lie about anything.

Here's a question: What do YOU want?
It seems that this current relationship is going to keep tearing you apart. You can't trust him and he's obviously making a lot of excuses. You have to live your own life. Maybe take some time apart. Just be by yourself and ignore the other guys for a while. Sometimes, you have to be selfish and think about yourself. This is your life, do what YOU want and decide on what YOU need to be happy.

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Evil School!!
May not be on LF as much, due to unforeseen circumstances.
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-Fawn