My ex messaged me but but replies late?

For the last few months we've mostly been no contact but I checked up on him a few times and wished him a happy holiday and happy birthday. I used more endearing terms lately too see how he would react and noticed a subtle positive response from him, and a few compliments which he hadn't given me since we broke up.

A few days ago he messaged me asking me how I was, which is the first time he took the initiative to check on me, and he seemed kind of affectionate at first but then started to reply a little late then hours late (to be fair I replied a little late from the start as well because I was busy)

I basically told him some of the problems I was having were solved, he said he was happy for me and I left it at that. What should I think of it? Do you think I should try to break no contact further?

My ex messaged me but but replies late?
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