I highly doubt you're going to get anyone here to tell "OH YES...CONTINUE BEING HIS MISTRESS".

Your integrity and self-respect should be most important right now, not the fact that "you're feeling this guy". He'll tell you things like "I'm divorcing her soon, blah blah blah" just so he can keep on stringing you along.

Say you guys end up being together and he divorces her, do you honestly think that you won't be wondering everyday "Is he lying and cheating on me?".

Don't be a mistress. It really makes you look bad, especially now that you know he has a wife.