well first up it was just the way you said it as if everyone who did that would just lose confidence and burn out, you just put a stereotype out there and implyed that EVERYONE who falls into that would behave exactly the way you said they would, which they wouldnt.
anyways, I cant really think of a good way to put this into words but if you like/love/crushon/whatever 4 girls at once, you dont like/love/crushon/whatever them at all.
your either simply
a. in love with the idea of being in love
b. just want to stuff around and have sex
c. hoplessly insecure
d. something else, dunno.
point is, you can keep your options open and **** around sure, and I'm not saying that theres anything particully wrong with that, but thats not really the kind of behaviour or attitude someone trying to get into a meaningful relationship should have (neither is it the kind of attitude most girls wanting a relationship would be looking for)
thats my take on it anyways, to give an example, if vermy really does like 4 (which all his posts strongly suggest he does) then he shouldnt be intrested or paying any attention to the other 3 (espcially number 3 because shes a **** sandwhich) otherwise how can he honestly claim that he really likes her, and he may not be lying to her directly, but if he was stuffing around with other girls while they have a 'I like you, and you like me, when I get back lets get together' that would be deceitful to her (unless of course she knew all about it)