Would you leave over lack of sex?

Leah

husband and I have a pretty significant age gap. we have a 1.5 year old and I'm 34 weeks with baby #2. Married almost a year. We love each other, we're best friends. He has been having trouble getting it up. We have gone through a 14 month dry spell. idk how I made it through that. Tonight he finally tried viagra and so far, it's not working. I think fatigue has a lot to do with it. I have always had a nigh sex drive. He could go the rest of his life without it. Part of me just wants to bang someone on the side. I'm a total loss on what to do.