Greetings,

My ex and I split off before Christmas (wonderful time of the fucking year) She is 5 months pregnant and the baby is a girl. We have hooked up numerous times post break up, talked to each other like we always have, shared the same emotions, serious thoughts about us getting back together, and hell even went out to our favorite restaurant that led to our first hook up after the break up. Here is the thing: I am suffering from massive oneitis at the present moment and acting like a complete beta bitch. Her friend introduced her to a new guy a week ago who is a Marine stationed out in Florida. My ex has been a lot more distant and constantly chatting with him. I made it clear to her that I am not cool with her chatting him up right in front of me (which she has done numerous times) because it is disrespectful. I also raised the issue of this fucking up our progress and she blows it over her head. She threw the same back at me with my previous mistakes in the relationship (we both made a ton) I admit I am suffering from oneitis even getting to the point of the "nice guy" and in love with her still yet she is moving on. I have been contemplating deleting her off every social media platform, using radio silence except for her appointments/birth, and walking away a hundred percent. Every single time she hears me hanging out with other women she gets paranoid and which usually leads to hook ups. My question is how to handle this maturely and save my own sanity?