I struggle with obsession as well but with my fiancé in general. The good, the bad, how his family feels about me, if his friends are going to make a move on him, his health, etc. I find it temporarily helps to talk about it with him. Oftentimes, it's just paranioa - others it's legit. Double checking can help, "Hey do you notice this too is it just me?" That said, it's smart to try to be aware of what makes you jealous and triggers obsession.