Agree with others posting.

You need to GAL like a mad man and smash the gym HEAVILY. Stop trying to please her, it’s a waste of time.

And when she drops the bomb, without an ounce of hesitation say “I respect your decision” and walk completely in the other direction. Don’t do it half-heartedly or in the hope she’ll crumble, do it with complete authority and arrogance.

That’s the only chance you have at this point, and even if it doesn’t work out (which 90% it won’t) at least you made a good start in the right direction with your new life.