Yeah that's different. That's breadcrumbing/stringing things along. If he had just been completely honest 100% of the time that he never intended to have a relationship and that he just wanted FWB and it was you who said you were OK with that and that you didn't need a relationship with him... that's what I was more talking about.
But that doens't sound like what he did, now you explain it more.
Fuck him. You're better off, definitely.