He's older and (it seems) didn't have facebook. He may not have known she was going to post pics of them. Also, since he didn't have facebook, she couldn't tag him in photos, and I'm sure they didn't run with the same crowds... no danger of his family finding them... until now.
Suicide by hanging is pretty difficult to stage, so I'm of course leaning towards him doing something to her, then committing suicide, unfortunately. Although I do like a previous poster's hopeful scenario of her running off first... then at least she'd be alive.
I realllllly want to know if/when she found out he was married.