Don't be too hard on yourself...you didn't do anything but open your heart to someone else. He has the problem, not you. I dated a guy who did the same thing. I think the high they get from chatting with women on line can become an addiction.

I felt similarly to how you feel...like I was a chump for dating this guy and I felt like a fool. But we are not chumps or fools...we just got involved with men who have issues...and who cheat!

I would tell your guy what you found out and see what he says. But be prepared for more lies. At least you know who he is before you got too serious, like getting married.

I am sorry you are going through this....it really hurts