What’s the extent of messaging people from work OUTSIDE of work?

A couple weeks ago, a guy I work with called me at 4 in the morning. I didn’t pick it up as I was sleeping which then led him to call me for an hour and a half. I then got up and sent him a message asking if he was okay, he was. He was just under the influence and I guess by a lot. He then proceeded to message me and I asked him why he wasn’t talking to his girlfriend or calling her, which he replied with “fight” I did ask why me out of all people, and he said cause we vibe at work. He also complimented on how I looked on our work do, which took me back a bit and said not to say that but then he covered it with the “it’s just a compliment”. He then called me and told me to pick up because he wanted someone to talk to and I was not keen on it. Then he told me that his girlfriend had an argument about me because after the work do I messaged everyone including this guy “hope you get home safe” as we went somewhere further away from home and we were all drinking.

ANYWAYS I don't know does this mean anything? Like what should I do about it, should I do anything? Or leave it? Or talk to him? Any advice would be great :D
What’s the extent of messaging people from work OUTSIDE of work?
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