Why do I keep getting played by these guys?

All I do is mind my own business, work and attend class and these guys keep forcing themselves into my life just so they can play me? Why? Why go to all that effort when I told you from the beginning that I physically don't have the energy to deal with any type of relationship shit. They convince me otherwise and play me so hard. And the last two have been the worst, both of them within the same year. I cannot deal with another situation like this, I'm emotionally drained. I can't help but cry while typing this out. I don't even want any pity, I just need to cry it out for me. I'm so worn out, I gave up on this long ago yet I keep getting played. And when I say played I don't even mean cheating, they lead me on, tell me everything I need to hear, become my support system, just so they can tear it all apart.