Girls....riddle me this?

So I've dated some very attractive girls lately with great n not so great personalities(im 25 btw) so here's my problem....i can only keep a girls interest 4 hmmmm lets jus say not so long and its making me vry depressed and confused. Im not a jerk but im also not a toolbag nice guy. I do have a habit of making myself 2 available i guess sometimes but its jus cuz i like to get 2 kno a person....this whole girls want what they cant hav thing is so stupid, i mean if i cant hav it why the hell wud i want it? i like things i know i can hav cuz it makes me feel more secure with persuing someone, mayb im the only 1 that feels this way....wy do girls keep hitting on me n telling me im adorable n then either never respond to my texts or date me for a week n then lose interest? All these pokerfaces n lovegames r lame where the hell r all the real women....not the ones who say that theyre real n really not