Most people only read Wolfman and Perez era cause it's the best and quite frankly the rest doesn't really live up to that.
Donna's marriage started to go sideways after Wolfman left the Team Titans.
"The break up happened in Team Titans after I left it. I disagreed with it and said so, but the writer did it anyway. It was wrong in my mind to do it--Donna and Terry would not suddenly split up that way. They may have split up if we saw a real problem between them but I just had them occasionally have Donna's power come between them--something they would have gotten through. Once the divorce was done though, and I got the character back, I could not simply undo what was done. Hence my following up on it etc. It was an editorial decision that led Donna to Kyle...which I also don't feel was right, but had no real reason to argue. IF Donna split with Terry and Dick was splitting with Kory, I would have very slowly had Dick and Donna get together...which I did suggest in an overview memo."
This scene was written by Wolfman.