What Should I do I Love My Boyfriend But I Am Afraid?

My boyfriend and I have been dating for 6 months now and I love him so much .. I have never felt this way about anyone before .. Well he has been talking to this girl that he met on myspace and she is falling in love with him .. When he was asleep I took his phone and looked through the messages between them and she told him that she loves him and he says awww your the best .. I got her number and told her to please stop talking to him that I was his gf .. He got all mad and told me to stop talking and texting her and I told him only if u promise that you will leave her alone .. He told me that was fine and she was just a friend .. But last night we were at dinner when his phone rings and it was that girl .. He chatted with her for like 10 mins .. I took him to a nice romantic dinner ... I love him 2 death and i dont know what 2 do .. Please help! I dont want 2 break up with him either .. I cant picture my life without him .. Thanks