My girlfriend is venting to her ex-boyfriend and it's really upsetting me.
Are you jealous of your girlfriend for doing that?
Yes, I feel like she's using her ex-boyfriend as a way to make me feel bad.
She may not feel comfortable telling you certain things. She may find comfort in talking with her ex-boyfriend with certain things. But I do understand how that can make you uneasy.
I've had enough of this, I'm going to throw her out of the window.
I know it's weighing heavily on you right now having to go through this. But I would try to understand that it could be just as simple as her needing help from a person that understands what she's going through.