after never having had any contact with any exes in all of the years you'd known him, would you be concerned?
I trust him completely - but I am a little bit as to why he would suddenly do this. I have exes on my FB but there's always been a continuity of friendship there, I haven't suddenly sought them out.
Should add, I wasn't snooping, as such, he left his FB page up on my computer account and I thought it was mine. But I don't know how to broach it, or whether to bother really.