Because I still haven't confronted my H. I don't know how to start this conversation, and I'm scared of the end. He knows something is up, because I'm not able to act normal. He keeps asking me to tell him why I'm mad.
I won't be able to put him off anymore, so I guess tonight we'll have it out.
You could ask him for his password and see what he does. Say, you've been feeling like you did since the last time he flirted on FB and would feel better if you checked his account. It's made you feel down and you don't know how else to shake it. See if he protests or offers. If he offers, then that's the opening to ask him about the message. If he goes behind your back to delete it, then bust him. Tell him you knew and the delete proves he did something wrong. Then go from there.