Now ExBF cheated, dumped him, why isn't he even trying to ask for another chance?

Well as a guy there is a good chance he is just giving you space and time to think things over. He he knows you won't be swayed by flowers and such then space and time could be what you need to him.........and it's clearly working if your asking this question. The big question is can you forgive him for what he has done? If you can great maybe the therpist is changing him. But if you can't forgive him and you bring it up all the time it will never work.