Sex and assholes

So I just broke up with my boyfriend of 9 months. For lots a of reasons, but mostly because he had lied to me about who he had been with intimately and when... We are still friends and neither of us overreacted. But for a while he said that it was hard for him to cum with me during sex. He said that my lubrication wasn't slippery enough and didn't feel as good as other girls. And then he mentioned the other girls that he had lied about to me... I'm Cystic FIbrosis patient and I wonder if I really can't produce regular lubrication... Or is all of this just bullshit and I should just forget about it? lol I can't tell, but it really knocked my confidence down.