Giving up

I am about to lose faith in finding a guy. I have had such bad luck the last few years with men it is ridiculous and upsetting. The past three guys i had started to really like and want something more and they seem to want the same thing, they turn it around and say they aren't ready to be in a relationship. Either the excuse is I'm not over my ex, or I just got out of a serious relationship, or I need to figure out my shit and I don't want to drag you into it. I am so fed up with it all and it's really killing me inside.