I think he still has feelings for you as his mars is in your first house of libra. You are venus, and his sun is going into leo- maybe he is really thinking of himself!!
Just a guess but if you guys were off and on for awhile, and he just got out of that with you...and into now this other girl....unless she is pushy about marriage. I don't think or see from this chart Marriage anytime soon. Saturn is also in 1st house which is delays....so maybe don't worry right now.
How does he react to you? Is he respectful of his girlfriend? because many times a women has a "gut" feeling. If you guys do not have any contact. You may just assume to let him lead his life. IMO....
Having anxiety is something I understand, but try to work on what is on hand now. Like having contact with him, communication and a working relationship.
Ps, I should take my own advice cause I also jump the gun too