3rd trimester... So emotional

Im 30 weeks on Saturday. I feel bad because my fiamce amd i barley have sex anymore. I know he watches pornbwhich i dont exoect him not to when i dont want anything to do with sex most of the time.we just had sex and i. Feel llike he didnt enjoy it at all. Now im all in myhead thinking everything bad.i just wanna cry. I love him so much buti really thonk hed rather be with someone else. Ive talked to him about it but says hes happy with me. All he does when he is home from work is talk about his boss who is a female and really pretty and skinny. I think hed rather be with her.