still reimagining (prolly forever)

Very rough translation (feel free to provide corrections if needed):

Professor (P): "Looks like things didn't work out between you and Kikukawa."

*note: Kikukawa was his college girlfriend whom he apparently married and divorced

Takayanagi (T): "..."

P: "I heard it from Kawashima."

*Kawashima is the gestalt therapist who's a good friend of Takayanagi and also a former student of the professor

P: "Was there cheating?"

T: "Maybe there was cheating."

P: "Maybe."

P: "My, my... I guess that's it."

T: "Yeah."

T: "I had a feeling we weren't compatible from the start."

😭😭😭

so he did marry his college girlfriend and got divorced. the fact that the professor only knew about it in the present time could only mean two things:

He hasn't seen the professor in a long, long time since Takayanagi became a teacher (we only see the professor in flashbacks from the college and post-college days) and/or;

His divorce with Kikukawa, his college girlfriend, was fairly recent. Probably why he had to turn down Aizawa's confession because he was still trying to heal.

So, what actually happened between him and his ex-wife? Who knows?