Well... You just don't know. Extreme example...

But what if some family member (grandma, cousin joe) or whatever down in Florida got hit by a bus and is in a coma and the whole family flew down to be with them. I'm not sure that I'd call someone I'd met once to apologise... I'm really not sure that it would even occur to me to do so (with other things that would be at the forefront of my mind at that point in time).

Extreme example to be sure. I guess my thought is just that there are any number of understandable reasons why he didn't contact you. He could have lost his job and have fallen into a depression or lost his internet connection or his house could have caught fire or... Well... Who knows.

All I really mean to say is that the only way you will know is if you ask him. And if he says 'yeah, it would be good to catch up' but then doesn't... Well... After a couple times of that it is time to cut your losses. But at this point... Good to at least let him explain methinks.

(I wouldn't push him to explain either at this point. Just say you would be keen to catch up. If that does happen you could ask him out of curiosity).

I just mean... He could be Mr right... But things do come up sometimes...