Pleeeeeeeeeasee helpppppp?

If it was indeed his first love he will always have feeling for her, but you have to get past that. He is not using you to get over her he is just trying to move past her. Don't be so insecure or it will push him away. Looks have absolutely nothing to do with his feelings for you or her, it helps but it all has to do with personality, trust, and being confident in yourself enough to know you are the one he is with now and not her and if she does look better than you it is her loss, you have him now so be happy and enjoy the time you have with him not worrying about his ex