Ttc is this normal?

Hey all, it’s now been 2.5 years of ttc and just received yet another bfn. I don’t know how to put this but, I’ve grown tired of sex. I’ve come to resent my relationship because I can’t get pregnant. I don’t even want to be looked at sexually anymore, I just can’t enjoy sex. Would you say it’s time to take a break? I love my boyfriend but idk it almost makes me mad at him, like why can’t I get pregnant. I’ve done everything I can on my end but he refuses to get checked because “he knows it’s not him” but I think it is. So it’s making me resent the fact he won’t do something simple and get checked so that we can start a family that he wants soooo bad😪😓