Do Men Act Strange To their Girlfriends When They See New Girl Outside?

do they?

Woman,  they are the most precious thing on this planet, BUT every single one
of them is for LEASE. Like Eddie Murphy Said,  you buy something for now, she"ll asked you
later. what have you done for me lately? and if don"t leave up to expectation, she's gone.

What a same,

Well you're right but i do not entirely agree with you, a guy may love you very much but act a bit strange when he sees a more beautiful girl, itz not as if he doesn't love you but itz just a natural thing, it only gets unnatural when he extends his looks to something else you wouldn't like.
this topic is just like the one CAN SOMEONE LOVE YOU AND CHEAT ON YOU?

look the reality is that a man would never act strange to his girl,that is the girl he loves so much even if he sees another girl,he might just be catching his fun with the other girl,without having one bit of feelings 4 her,but his love 4 his first girl will not die,niether would he act strange,i am talking 4rom a male perspective,and i am sure most guys would agree with me on this issue,but u know the sad part?most times it is this girl he has feelings 4 that may now eventually mess up,u c,this is where there is diversity in the behaviour of males to females,as for the females,once they start seeing someone else,90% of them start mis-behaving to their first guy,they make it so obvious to the guy,just to frustrate him to drive him away,so my dear as it is how u ladies do most times,do not think that is how guys are,at least to some reasonable extent,with every other thing being equal,ok. 

iice you got close to it, liked ur opinion, thumps up

yes they do o, and me thinks its because they don't want to give the impression that theyre attached. in case they want to start something with the new girl. men are just shady like that! 

  Yea,we do.But the nature of the behaviour is related to how much we value our girlfriend and how serious we are with them.