My girlfriend is dating another guy
If your ex gets into the habit of calling you up at any time of day or night, and she knows that you will drop everything to rush to her rescue, she will begin to feel like she has power over you.Some women won’t take advantage of that, but many women will.
I mean, what happens if you're in a relationship but like someone else? Hopefully, your partner is the main person you're interested in, but it's perfectly fine to think, "Hmm, maybe I'd be into that person if I were single," every once in a while. If you never ever think that and only have eyes for your partner, more power to you. If you're stressing about this, I come bearing help!
For example: A guy might let his ex use him to do handyman jobs around her house, help her with bills, or running her errands.
Again, there’s nothing wrong with being helpful to an ex, as long as you don’t let her walk all over you.
Alternatively, he might also refuse to date other women, even though his ex is dating other guys.
In his mind, a guy like this is likely thinking, “Do I really want to be with a guy who has nothing else going in his life, and needs me to give him purpose? What did I see in him if others don’t even want to be around him?