I'm very sorry that you're dealing with this. When someone is able to cheat on you once, it makes it even easier for it to happen again. Do. Not. Settle. Even if he only cheated on you once I'd reccomend you leave and never look back! But this happened with multiple girls, over periods of time. Who knows what he hasn't told you. Only reason you know what you do is cause YOU caught him. He couldn't be there for you even when you needed him most. Is that someone you want to stay with? Screw (couples) therapy. Get whatever help you need, but get it for YOURSELF. 
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