Why do I fall for the same guy?

Since, I remember I always ended up falling for the same guy. The ones that drink and cheat and are not serious about me, that ended up leaving for another woman (please dont judge) I have good guys that wants to date me and Im always attracted to the ones who like me but just to have fun with.. i feel like I have something wrong with me and at this point my self esteem its on the floor, I havent date some one for a while and Im affraid to do it. I dont know what to do, I feel alone and i always ended up with guys that I didnt like at first then when I like them, they start treating me shady the way I treated them. what should I do?