He says he would go out with me if he was single

This is similar to one of my other questions but I'll put more information on this one..I Like This Guy. He Likes Me Back. He Has A Girlfriend but says he would go out with me if he was single and I dunno what to do because...

a) If I fancy him his GF might find out

b) He would have to dump his GF to go out with me

So basically nothing is going to happen between us. I don't wanna split up a relationship but I asked him if I was making him feel bad about seeing his GF and he said 'kinda'. He told me not to feel bad but I can't help it...I really fancy this guy.. WHAT am I going to do..?HELP ME!x
He says he would go out with me if he was single
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