i just got done dating one of these guys (he broke up with me because he said he wasn't ready to be vulnerable to being hurt again). he had gone through a terrible breakup and when we started dating was always super affectionate when we hung out etc. he is also ridiculously insecure and displays the classic signs: the need for constant validation, constant attention (incessant texting), the need to constantly act "cool" in front of other guys, the need to have a girlfriend that OTHER guys think is hot and a chameleon personality depending on the type of people he is hanging out with. Things were going really well but we hit a little bump in the road because of a misunderstanding and some drunken hearsay and basically as soon as that happened I think he checked out emotionally, regardless of the fact that it turned out to be completely false. naturally it sucks for us, because being female, the affection is kind of what helps draw us in. we thrive off of that stuff! I'm p*ssed I fell for it.