Advice pls! Boyfriend secretly attempted to start a fb conversation with a girl on fb?

[whats_ya_flava]

So I logged on to my boyfriend's fb account one day because he wanted me to change one of his settings for him and I found a message in sent folder, basically saying hi and wanting to initiate conversation with a particular girl. I click on her profile and she obviously wasn't his friend and she was pretty hot/sexy.
My boyfriend didn't get a reply from her but i was wondering why he did that in the first place? I have been wanting to confront him without trying to sound like i am a paranoid girlfriend who went through his sent messages.

It makes me wonder if he does chat girls up online, possibly on other chat websites?
What should i do? is this normal? Am i being way too paranoid? I keep thinking about it!
If your advice is to confront him about it, how shld i go about doing it?