Severe Anxiety about boyfriend leaving

Does anyone get severe anxiety about their boyfriend leaving them? We recently had sex for the first time after a long wait due to my trust issues (nearly 3 years). I’m not terrified he is going to break up with me!! It’s irrational but I feel SUCH a connection and love with him now I would probably die if he left lol. Can someone please tell me I’m being irrational? My heart hurts so bad lol