My college boyfriend looked a little like Tom Selleck, but the thing was he sounded exactly like Tom Selleck. Could have passed for him on the phone. He didn’t cultivate it or anything.
Weird that this thread should come up now. I just say Shrek 4, and was struck by how badass alternative reality Fiona looks like my girlfriend from college, although normal Fiona does not.
And, no, I don’t recall any kilts in college, so that’s not it.
Kabuto Yakushifrom Naruto. Except with light brown hair. Plus my ex is nicer and doesn’t work for an evil snake guy. 
Now I’m reminded of Lita from Sailor Moon saying, whenever she saw a cute guy, “He reminds me of my ex-boyfriend!”
Guerrero from Human Target; more the attitude and job-type than looks <though they share similarities there too>.
I want to say Julia Roberts’ husband in Sleeping with the Enemy, but that probably wouldn’t be very nice.
I don’t think we always have to be nice. I joke all the time about my ex being Aqualung from the Jethro Tull song.
Demi Moore in Ghost bears a frightening resemblance to my ex…beyond the facial resemblance, she was about the same body type.
I use the word “frightening” with intent! I’ve seen the movie once, and I don’t care to ever see it again.
Take this guy, the exact cheesy 'stache, a similar paranoia level, ramp up the organizatinal OCD a bit, and dress him like Howard from BBT (but just plain white v-necked t-shirts, no turtlenecks) - and presto, another ex.
…the towel straightening, the kitchen organization, and last the thing he did every night was to line-up the remote on the end table so it was perfectly centered.