Not really attracted to him...

Andy

So I met a guy online and we were talking for a few weeks trading pictures and phone calls and whatnot, he told me he fell in love with me and I think I might have too. Last week though we met and had sex for the first time and I just wasn't sexually attracted to him, specifically his penis. I feel so selfish though because the whole night was basically him worshipping my body and I loved it but when he asked me to reciprocate it was awful for me. He also has erectile dysfunction issues and doesn't have a "normal" looking penis (very small andoddly shaped) so I felt so bad for confirming his deepest insecurities. What should I do about it?? I mean I really do think I might love him and he says he's fine with sex just being about my pleasure, but it doesn't feel fair for a relationship to be one sided like that. Should I keep trying to reciprocate even though I don't like it and he knows I don't like it? Is this an unhealthy relationship??