I get unattracted to guys soon after being in a relationship with them
What makes you lose attraction?
I haven't found what I'm looking for in a man's personality
It's okay to not know what interests you, but you have to be careful not to hurt other people in the process. If you break up with someone, make sure they understand why.
I try to.
Then make sure you tell them that it's you, not them, that's the issue.