Why do I fall for guys so easy?

Okay.. so I just realized this.. I met this guy on my ipod thing.. I started talking to him on Photo Messanger but then I started to text him.. we texted for about a year and I liked him a lot!! We would play the what if game.. like he'd say what would you do if i pushed you on your bed and i would say i would take off my clothes.. and he would say then I would.. etc. stuff like that (all the time) I really liked him and he really liked me but we lived far away.. so he got a girlfriend. IT BROKE MY HEART i was so freaking sad.. i was over him then. then this guy from school started talking to me.. he liked me and asked me out.. honestly.. i liked him.. but i said no:( then HE got a girlfriend.. and then i met these guys on omegle and they're my age.. and they live nearish me.. i've been texting the one quit a lot and i only have been for about 2 days.. so yeah.. OH and I was texting him and he said i have to go im going to the movies with my girlfriend. I was like oh.. okay. SO thing is.. I FALL FOR GUYS WAY TO EASY how do I stop this??? please help:( my heart gets broken way to much and it takes me forever to get over a guy