She's probably seeing another person.

You're just the handy person that is/was there for her whenever she needs to fall back in case of anything.

Personally, you should just walk away. You made the right choice of walking away like a man, with your dignity intact. Keep doing so and let others think what they want.

You went through a lot recently, I know. Personally, it sucks.

You wanna go 1001 things to get back with her, but trust me, it's not worth it.