I forgot to say my wife is nasty at times?

Ok so I get home tired from work and my wife starts to get freaky she wants to have sex bla blah! But she dosent turn me on any more she tells me I am not a man and that she needs sex too but to me she is talking like a hore we have a baby but I just can't stand her at times sometimes she tries to get sexy but I just can't and I think I like her but not love her we Been married 4 years and I use to love her but I dk what's wrong do I need help or what :(