Sorry to hear about your situation. In reading your post I had a couple of questions:

Did this “friends with benefits” arrangement just sort of naturally happen? At any point did either of you quantify what it was and it was not?

Regardless of whether others tell you your feelings are justified…there you’re feelings…so to me that justifies them enough.

As for the unconditional love aspect I’m afraid I can’t help you there. If it were me I would find it very difficult to maintain any sort of relationship (even if platonic) with this person just based on what happened. I’m not saying you should hold onto any anger or resentment…but if having that person in your life and seeing them periodically has the prospect of dredging up those feelings I’d say you’re probably better off without them.