Whether your ex is crazy or just her friends advising her or both, best to let it go. It may be difficult and there were possibly some signs that things were better, but trust me, it isn't worth it. Work with your lawyer and steer as clear of this person as possible. Depending on your membership at the gym and what is available, either find another gym or go at times you're pretty certain she won't be there. If for some reason you do end up at any place together, steer wide and for god's sake, don't speak to her or anyone with her.
Go ahead and fight the trespassing charge or look at it as getting a cheap way out of what could potentially be something far worse. Absolutely don't take it upon yourself to try and fix anything. Just follow your lawyer's advice to the letter.
"If she were any more of a bitch, she'd have puppies!" Victoria Chase, Hot in Cleveland.
Current project: La Fée Verte