Leaving Boyfriend

I am thinking about leaving my boyfriend, because I have thoughts like he is lame, my relationship is lame, I don’t like him, I have nothing to do with him.
I think I stay because I think : It is more comfortable to be with him than without him”, “I would be miserable with anyone else” “I can’t be happy with a man”…

because of that, I am thinking about leaving him.

In LCS you say, “Be happy with the situation before leaving.”

But actually these thoughts make me really unhappy. I think I should leave him because the thoughts I have about him make me so miserable.