marriage help

Me husband been married for 17 years well I found out he cheated I gave him other change but he said the reason he cheat was because he wanted a child and I have pcos that hurt me so bad so I gave other changes 😢 thing is I've been taking colmid so when I ovulation I tell let's have sex but he always come up with I'm feeling sick it makes feel awful because it seem my trying ever thing and I'm the only one trying is this the end of my marriage and I'm always thinking if he's think of her when we have sex 😭😭😭I'm so hurt still I need some advice