Is it normal that after 2 yrs now i feel this way?

Me and my fiance have been together for 2 years and after the first 9 months we were sexually active and then we stopped for religious reasons..lately things have gotten almost back to that point again..(Oral)..before I was okay about it, maybe a little conscious about his fluids but it wouldn't bother me..since we have been arguing about him lying about females, some he hung out with and what he claims happened and didn't happen..when it comes to going down on him..idk I hesitate, like it makes me sick..and although I want and can almost believe nothing happened with these females..idk if this is what's making me this this way about him sexually..anyone got some help for me..am I the only one? Is it the act itself that makes me sick or the situation?