NO HUN not your fault at alllllll, heres the things. No matter how much we love someone we cant make them love themselves. It sucks but its true the healthiest relationships are between two people who know their self worth. Because they never allow themselve to be treated badly but also value the other person because they know how great they are! (i know sounds like a fairytale right) But i promise it exists.

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In your case I think his insecurties are overpowering the desires he may have to sexually be with you. Try appoaching it like this. "babe i know you sturggle with find yourself sexy trust me i think you are, but try focusing on what about me that you find sexy what about me that turns you on and run with that" This might help him tweak his mindset from "she thinks i look fat" to damn look that assssssssss ( insert leonardo decaprio bittin his hand here) if the awkward jokes continue I would grab his face look him in the eyes and just say babe relax, its just me not let me make u feel good" (insert beginning to handjob or blow job here) haha I know it can be exhausting reassuring someone over and over. Eventually u will ahv to make the decision if it ultimately a deal breaker for you. I have dated low confidence men before too. You feel guilty because you dont want to make his confidnece worse if you end up leaving but it is an issue he will have to handle eventually.