Guys,
Need some advice whether to take this seriously or not.
I had a crush on a guy at work but he made it clear that he wanted to keep work at work ( after attempting to ask him out a few times... )

Anyway I haven't seen him anymore since I've left work and I texted and wished him all the best and hinted for him to stay in touch. And he responded "all the best to you too. Let me know if you want to catch up. "

So I was a bit unsure so I said: " I thought you are too busy to catch up " to which he replied, "no it's not that. I told you. I prefer to keep work at work. "

Call me dumb, but that catch up statement sounds a bit too casual to me. Does it mean he is interested but doesn't want anything serious, a fling? Or he is just being polite because I left? I don't want to do any more chasing. I feel like if he wants to catch up here should take initiative?