OP, I really feel for you, but the facts are the facts, and you are quite right. A decent person wouldn't treat you like this, and neither would someone who loved you. He was NEITHER of those things.
His protestations of love were his 'back-up plan' for when he decides he wants to pick you up again (only to drop you again when it suits). He hasn't gone 'No Contact', because NC is what people who are being abused do. People who are breaking up after 16 months have the long awkward conversation where you let the dumped partner ask any and all questions, and you try to explain falling out of love as best you can. Then no further contact because it is over.
What he has done is Ghost you, and that is the action of a spineless yuck-man at best.
As someone up-thread said, ,he's classic - sweeps you off your feet saying anything and everything you want to hear. Then backtracks when reality hits. He's emotionally unavailable, and he will always be so.
Someone doing this is a huge red flag (rather than an amber alert) and red flags are deal-breakers in my book. Whenever you find yourself acting a certain way to sort of prompt the other person into reciprocating, it is a sign that you are trying to teach another adult how to behave (using demonstration), and that's a sign you are losing yourself into the relationship. It's starting to descend into being a game and a power struggle, and that's not what relationships are truly about. So again, I'd see that as a deal-breaker.
I suspect that if you get really honest with yourself, it isn't him you are missing. You are missing the idea of the relationship, the 'potential' him he would turn into if only he would become the person he pretended to be, and the hopes you had for the future.
There if far better out there for you, and he was in the way of you finding someone who was really compatible (if you want to). Please don't ever take him back. You've seen this is a repeating pattern. It will repeat for as long as you let it, because men like him will keep playing the same game for as long as they can get away with it.