<human>: The title basically says it all, but I'm having trouble coming to grips with the fact that my wife is facebook friends with an ex from college.  He is also married as well and lives across the country, but the fact that he will interact with her (like photos, comments, etc) makes me feel uncomfortable.  I to explain in the reverse scenario, if I had an ex gf from college that still interacted with me, how would that make her feel, but it didn't really go anywhere. I feel like I could understand if it was a high school relationship but for some reason it's just weird seeing an ex "check-in" every now and again.  And I don't know what to do. I am also possibly overreacting but wanted some input from you guys. Thank you!

Could you distill the essence of the text into 1-3 sentences?
<bot>: Wife's is facebook friends with college ex (who is also married), he still checks in on her via likes/comments and it makes me uncomfortable. Am I overreacting?