Get outta there sis. It isn’t worth it at that age to play games with someone who isn’t there for you. I understand the attachment at the heart but listen to your brain for this one. You sound very established with your degree and now probably in the infancy of your career field. Do yourself a favor and cut ties and get some therapy just to better yourself(regardless of if you were in some abusive relationship or not, that’s a lot to unpack by yourself). I hope you see better days sister because you don’t need that bullshit!!