I just found out that I am the “Other Woman” what do I do?

dancerdez86
I meet a wonder man whom I share a lot in common with about 6 weeks ago. We have been dating ever since and yes, just recently, started sleeping with each other. We are both single parents and I felt it was going extremely well. I am 29 and he is 36.He said he was single, his FB says single, our mutual friends said he said he was single also. I had just found out yesterday that he has a girlfriend who is away at school in Italy. How did I find out? Not by him, by her posting something on his FB with photos of them and saying how much she loved him. He tried to delete it but I saw it first. I panicked. I called him right away and asked “Do you have a girlfriend? He tried to give me some story about how they were dating and she decided to leave and go away for school. I was devastated, I felt like a terrible person. I told him to leave me alone and that I was bowing out of this situation because I refuse to do that to someone.
Now he is calling me and texting me nonstop and wants to come talk to me in person and figure this all out. He said that he was not been happy and that he is looking for more in life and feels that I have all those qualities that he is looking for. He is making me confused. So I asked him ‘Why are you still reaching out to me?” What is it that you want? I asked "If I never found out, what would have happened when she got back?' He said he is reaching our because he has feelings for me but that he is so torn. But he also said that he isn’t sure what he wants. I told him it is one thing to feel “torn” but he is playing with two girls emotions.
The problem is that I really liked this guy but now I feel like such trash for even saying that knowing he has a girlfriend. He says he feels like he ruined any chance with me by not being honest up front.
I don’t know what to do. Do I just ignore him and tell him to back off? Do I tell him if he wants to be with me then he needs to leave his girlfriend? Am I wrong for saying that? Is he just playing me?
I just found out that I am the “Other Woman” what do I do?
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