WHy is y boyfriend acting like such a ?

Me and my boyfriend have had a rocy road, on anoff but finaly we've hit a good stride. I think w're both very scared of losing one another and are sometime jealous. However durng our last break up i became close with a guy. We were friends and spent a lot of time wit one another. He became infatuated with me but my heart still elonged to my curret boyfriend so he was turned down more than once and our frienship slipped away. We last hung outsumme and i founf out yesterday morning heped away. However instead of comforting me myboyfriend seems jealous because he did have a crush on me. I finally told him to drive em home. He is onmsn now and i don know what to say to him to ma him realise he being an . (PLUS hes going thew alot of family problems and strss too)