Best Friend Boyfriend Situation?

Okay, I'm dating this boy who I love to pieces. SOOO MUCH! And anywayz hes my best friends neighbour. Whenever I go to her house she won't let me hang out with him. but she always hangs out with him when I'm not heir and tells me all about it. I hate this. It pisses me off. I get so jellous!!! Last night they where hanging out together with a bunch of people and they hugged Im getting worried and I dont like this. What can i do. My boyfriend also told everybody that was there last night he loved me wich i thought was so sweet but thats besides the point. HELP???