Intense feelings - BPD?

I've just joined here in desperate search for help with my intense feelings. I'm diagnosed with ASD (and am currently in the process of a clinical diagnosis). I live with my fiance & his friend and things have been ok until the friend started to bring women over to sleep with. I don't have feelings for him but I have a horrible intense.gut wrench that makes me hypervigilant, obsessive & morbidly jealous, which is of course impacting on my relationship.with my fiance. He keeps telling me to stop it or he's going to leave. I wish I could stop, but my stomach & head just won't quit. I don't know how I'm going to get through this long weekend before seeing my psychologist again (for 2nd appointment) & I'm afraid I'm going to lose control of myself and do something impetuous & stupid (its happened before). I'm consumed with mixed thoughts & feelings and I'm getting annoyed with myself. I did some research & find I relate very much to BPD, it scares me & I don't want to lose what I have. My meltdowns & episodes are more frequent & intense, & my fiance won't take much more. I don't want to be like this or do this to him. My home doesn't feel safe to me, even though I should have nothing to worry about, but I'm afraid my emotions are going to make me lose all I have.