I've been having sex with a woman who's in a committed relationship for months. I don't want it to stop.
I really think it should stop, since she is cheating on her relationship and you are encouraging it. Is that really what you want from this fling?
Maybe. We've even had sex at her house while her man was home.
Eventually you are going to be discovered, and you really don't want to be in her house when that happens.
To be honest, the sex is great.
You wouldn't want someone to break up your relationship, so put yourself in her partners shoes and end this rendezvous.