How can i trust him after this?

[scoobydan2003]

So yesterday i went onto my boyfriends facebook and found all these messages about wanting to sleep with other woman and wanting to be with them. i confronted him about it and he said it wasnt him it was a friend of his because no one thinks we should be together. he was trying to reassure me and tell me he was sorry for me seeing those and that he loves me and he wouldnt do half of the stuff he does for me if he didn't love me. do i believe him and trust him? what do i do? i would appreciate it if someone would honestly chat and talk to me about it. and someone serious.