Hahaha! It's like they're psychic or something - the minute you pull away, they gotta try to reconnect.
But listen - about the new guy - don't be insecure! Look at it this way - after what you've been through, doesn't the ordinary risks of dating (boo hoo, he might break up with me - or me with him) seem pretty minor?
I've dated several men in the last 4 years since my divorce. But none of those breakups really rattled me - they always seemed minor after the breakup of my 26 year relationship with my ex.
Just have fun, don't make a big deal out of everything, and let this guy show you who he is. If it turns out he's not the one for you - well, hopefully you'll have had some fun dates in the meantime. And if he IS the guy for you - well, he'll already adore you, won't he?
Also - if you're worried about s.e.x. and gettin' nekkid in front of a new guy - honestly, that seems to be a problem only in women's heads. Men are just pleased you'll sleep with 'em.