Hearing about marriages failing making you uneasy

This morning I told my husband that I found out one of my amazing colleague exploded and walked out from his shift and later was said he had marital problems and his wife had left him. He then proceeded to tell me that he’s been hearing a lot lately that some of our acquaintances have already split. His brother knows all the gossip because everyone comes to him. Anyway, he said he’s been thinking that what if I eventually leave him too. I assured that being with him is all I’ve been searching for and wouldn’t destroy it for anyone or anything. Then said, who’s to say that he won’t leave to which he said he would never do that.

We have regularly sex, neither of us do anything sketchy and overall a great relationship.

It probably makes him uneasy also that I go out for a drink with my coworkers after work once a month or so. But I would never do anything to jeopardize my marriage. I don’t know how else I can reassure him. Or is this projection?