In love with a married man

I have a child with a married man we're so happy.the wife knows about our relationship.The thing thats worries me is that he does not want to have sex with me and dont know why? I tried to ask him what the problem is but i failed.He told me that his wife also does not wantto have sex with him since the baby was born.He always tells me that he loves me and he come to see me everyday.What should I do leave him or stay?

This depends how important sex is to you. The child will need its father anyway, so you cannot totally get rid of the man.