He went on dates holding hands with a different woman. He kissed and touched a different woman's body. His heart belongs to a different woman, he cheated. Cheating is not "penetration". Cheating actually starts in your head, and even if we don't consider it. He still did the things I already wrote above. So yeah, he DID cheat. And no, people should not stay together if they or at least one of them has no feelings towards the other anymore. it is toxic af.
also forgot to say, he didn't penetrate the other woman, because she didn't want to, not him. so yes, it is cheating.
It would be stupid if they were to break apart from each other, he didn't cheat & she didn't give up, he obviously felt like she didn't love him anymore because of her actions & she was fighting her own battles(as far as i remember, it's been ages since i last read the last update)
& also the other couple getting divorce was great & made sense