@kitkat1497,
For starters, this is not (yet) an FWB relationship, as far as I can tell anyway.
But it might develop into one.
It seems that you are both continuing this thing that exists between you, but you aren't really on the same page regarding what you both want out of it: you want a relationship, and he doesn't.
So you have to ask yourself: what does he want out of this? It sounds as if he is interested in a consensual FWB relationship for real, but it's hard to accurately judge something like this.
Look, two years is quite long to be still affected from a past relationship. If he wants a shot at having a relationship again, and it sounds like he has a chance at just that with you, he needs to get his sh*t together. So my advice is to sit down with him and talk it over. Tell him what you want, and tell him you don't want to be strung along. Be as nice about it as can be: no need to verbally bash him over the head, but make sure he knows where you stand by the end of that talk.
And if he doesn't seem to have the intention to change and try something more serious, you are probably better of taking some distance from this thing. You could still be regular friends in that case.