Should I just leave it alone?

[BabeHart]

We cannot know what his intentions were, although the internet is FULL of "picture collectors" and that may well have been his primary desire...

If he's interested, he'll contact you again...otherwise, there's no way to know if his silence is due to excusable reasons or not (although it takes only moments to reach out to someone)...

You say you left the Fb group because he was running hot n' cold with regard to how you perceived his interest in you...I will say if you are that hyper-sensitive then seeking potential dating/marriage partner's online is probably not wise for you...you need to have a thick skin and not taking everything so personally...