girl just move on ...omg..do not ruin your life for one sided feelings...best of luck!!
That proves what a jerk he is to keep you dangling on that hook even though he has no intentions of ever having a relationship. Really he's not worth any more of your time. Save yourself from all of this by blocking him now. And spend more time now with your friends and family and doing stuff that you enjoy to get your mind off of him.
Unfortunately he isn't contacting you out of interest for a relationship. The only reason why he keeps messaging you here and there is to keep you on the side in case he wants another hook up. That's all that many guys want is nothing more than just an empty hook up. Especially nowadays where no one seems to want a real relationship anymore. It's really sad but there's nothing you can do to change his mind.
In order to save yourself from further heartbreak about this you need to do as you said and delete him totally out of your life. Block him on every social media app and from your phone and email. Don't keep getting your hopes up over someone who just drops you crumbs every once in a blue moon just to make sure you're still on the hook.
If i were you, i think that the fwb thing is not something that interests you as a person. It sounds like you regret the way it went hooking up for the sake of hooking up, as you say, you are "suffering" because of it. I think most of us have had this happen to us, jumping into before being totally logical about what we want and how we should go about getting it for ourselves. You have learned from this... and now you need to hit the reset button, and move on, and i think that it would be a good thing for you to delete his friendship, learn from it, and move on to find someone that has the same relationship goals. Try to compartmentalize how you feel by writing in a "feelings" journal how you feel about what happened when you're feeling down, and when you close the book, try to remain free from further thoughts. Nothing will ruin your chances for a healthy relationship more than pining for something that never was.
Specify on dating apps what your relationship goals are, and you'll have much better luck. Hope you keep us updated on how you're doing.
Him sending you a message and saying kind things every now and then is not him saying he wants to be in a relationship. He's just trying to say thanks for the fwb that you had, and possibly let's have another hookup sometime if I'm in town. Not let's have a relationship. Sorry. If you need to delete him from social media in order to feel like the "relationship" is over, then do so, because there was never really a relationship, just a guy willing to have a fwb thing for a short time.