My guess why this comic is confusing people here is simply due to the fact that the Lemmy community is primarily made up of middle aged straight men, many of whom have probably dealt with bitter divorce and find the base concept of this comic impossible to relate to.
If enough people don't understand it, chances are the joke wasn't fully flushed out. I understand it I just don't think the punch line hit as well as it was intended. Maybe the last pane could have them having coffee and saying those things to an obvious suitor. Just an idea.
I disagree with the idea "you need to make your media as stupid as any potential audience". Sometimes, people are too dumb to get something, and that's okay.