Not Knowing Where We Stand (Lack of Boundaries)

So I've been having a difficult time lately with this person because I'm constantly confused about where we stand.

Maybe not so much where we stand but being confused about where I stand in this person's life. We've gone back and forth from friends to not friends to a bit more than friends and I'm tired of going through this confusing cycle that depends on how he is feeling that day.

I'm terrible at establishing boundaries and I'm not even sure if the problem here is the lack of me sticking with or establishing boundaries. I'm tired of just going along with how he feels about things between us. I definitely feel like I need to distance myself and remove myself from the picture, but that's difficult for me because at the beginning of this most recent cycle, I was given many reasons to think that us being more than friends was a realistic possibility he was interested in. (As for when or how interested, obviously not now and not much.)