>>9 "keeping an eye on her" would just show how clingy you are, I've learnt this much. And if you feel crap everytime your gf flirts with other guys, OP, you are feeling insecure. And insecurity in guys makes us less attractive to girls. And if your gf is doing exactly as you fear, OP, that she's seriously looking at other guys, then perhaps you are not doing enough to keep her interested in you.