Quoting rachel marie♥:" <blockquote><b>Quoting BareFootBabyMaker:</b>" Why do you assume that? He could truly ... [snip!] ... when he hasn't talked to her in so long and the last time he did was to tell her he missed her and thought of her often."
Ah, there it is. It had to be something else other than just a simple comment on a scooter pic on FB.
Like I said, you should really talk to him about it, or work on the issue yourself, I can't imagine how it feels to have that nagging thought in your head.