Old school friend, haven't seen more than twice in 35 years, partly because he's been overseas for most of them.
He's back following a series of personal tragedies, a really awful time which I won't share here. If I was a cynic reading this, I'd be wondering how much is true it's, but I know most of it to be factual and have no reason to disbelieve the rest.
Anyway, we ran with the same crowd at school but were never particularly close friends. Have a couple of niche interests in common so occasionally comment on each other's SM. That's been the extent of it until recently.
As he's back and sad, I invited him out with a group of friends, some of whom he knows, and he's invited himself to come to something I go to regularly that's connected to one of the interests. That's fine, I take lots of different people.
However, he's messaging me multiple times a day and the messages are full of innuendo. I think he'd say that just the way he is (and tbf he's been in a country where PC hasn't really happened) but it's making me uncomfortable. So much so that I've invited another male friend to join us at the thing.
I know I need to not be a wimp and step away, but....