Is it wrong that i get mad at my boyfriend because girls are always coming on to him?

ok lately i've been having these feeling that my guy is messing around i check his phone but i never seen anything wrong but then he just started this myspace bs and i know his pw so i checked it and these girls wrote hime saying "what uo y call me" and gave the number so now my mood is all messed up and i cant even watch this movie. i can't tell him i have his pw what should i do i love him so much we live together. its just hard for me to trust him because i was the other woman at one point