I know exactly what you're going through. I do the same thing with my boyfriend. Are you on any anxiety meds? I have a problem with obsessing over things & worrying myself to death. I have made myself a visual called relationship reminders & when I start to worry I just bring that visual out to remind myself that my boyfriend does love me, does want to be with me, and does care about me. Something that I always tell myself also is if he didn't want to be with me, he wouldn't.