Why do girls do this when they see me?

Usually when i go out i see girls trying to get near me and want me to talk to them or something? And than they say.. U see he didnt talk to me that jerk,etc? This happens regular basis its Annoying i dont need 50 girls a week regardless if im hung like King Kong thats still not an excuse to cheat on your gf? So why are alot of girls annoying me? And dont go away? If im married and my wife sees all these girls around me she might get nervous? Cause its like i got Groupies?