My [27F] boyfriend [29M] just called me fat even though I’m 5’2” and weigh 120 pounds. Why is he doing this? How do I move forward?

I think I’m a good catch. I’m a mechanical engineering PhD student at a top 20 program, have a bachelor‘s and master’s in mechanical engineering, have hobbies such as painting, hiking, and I take care of my appearance enough to do skincare and makeup. I have had strangers stop to tell me that I’m beautiful, so I guess I am moderately attractive.

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yet I have this boyfriend who keeps trying to knock me down a peg by calling me fat. I weigh 120 pounds at 5’2”. I don’t know how it’s so nude to just be nice to people. It takes no effort, so I’m so confused why he’s doing this. Even if they’re just “jokes”, then why is he making them? Maybe he is insecure about the fact I’m working on a PhD? I know I have no problem attracting men and finding another option because I once signed up for a dating app and immediately got tons of matches within the first 10 minutes of signing up.

Yet for some reason, I’m too scared to break up with him because I fear that I’ll never get married if I do. How do I get over this fear and move forward?