My boyfriend messaged a girl on Facebook?

[thunderingmother999]

So me and my boyfriend have just came back from a lovely holiday and are now saving to buy a house together. We've been together for over two years and are very happy together. 8 months ago I found a message on Facebook to one of his girl friends and asked if she wanted to go back to his and spend the night. I was devasted about this and confronted my boyfriend, he promised nothing happened between the them and nothing came from the message. I know he loves me and I have finally began to trust him again and we're closer than ever! Am I being silly trusting him again? He's still friends with this girl but assures me he does not have any attraction to her and wouldn't cheat.