Totally ignore my ex?

My boyfriend unexpectedly broke off our relationship 5 weeks ago. He's having a bit of a quarter life crisis re work and his future (feeling depression & anxiety), and has already once told me once he's not sure if he's done the right thing breaking up with me. I have told him I'm available if he needs to talk, but I am not contacting him because I am hurting. However he messages me still. I have been replying. Now I am not sure if I should a) not respond at all or b) respond very curtly i. e. with just a thumbs up or a single word. I have already tried doing the whole "hope everything goes well for you in the future, good luck" kind of goodbye message.
Totally ignore my ex?
Add Opinion