I laughed at your creepy man story not because it's a funny story but because somehow I seem to attract some weirdos, too. It's hard not to ask yourself, "what vibe am I giving off if this guy is like, 'yeah, i'm going to go get me some o'that'?" I have trouble saying "No" and I do not have a good poker face so my anxiety goes through the ROOF in situations like that.
While my H is not (that I know of) in a relationship with anyone let alone someone 20 years my junior, at BD he did tell me that he was leaving and that I should see him as doing me a favor because women in their mid to late 30s are approaching "past their prime" and that I should be grateful that I have some "attractive years left" to find someone else. Wasn't it so nice of him to consider me in his BD?