<human>: To explain: my sisters fiancé (lets call him jack) hit up one of his old lovers after running in to her at a gas station(let's call her scarlet). Jack texted scarlet 'good morning sexy', hid it in some sort of hide app on his phone and then showed up randomly and unannounced at her house. She sent him away claiming she has a bf and won't cheat. Now this story is from him and her with no way to verify of course. After my sister spoke with scarlet and confronted jack he finally fessed up. She forgave him and they're still together. She said that since nothing physical happened all they need to do is fix the trust issues. I said she's a fool and that it is still cheating. There's a whole lot of back story to this but to sum it all up the entire family (multiple siblings, parents are divorced so lots of parental figures) doesn't like nor trust him and we've all said that he's cheated before and he will cheat again, especially since she stayed with him after this. Do you redditors agree? Was this cheating? If so, do you think he'll do it again and do you think she should've stayed with him? If not, why? Do you think this is forgivable and fixable? I personally don't, but I'd like to hear your opinions and see if maybe I'm too black or white in this matter. IMO if you cheat on me we are done, the end. Maybe it's not that clear cut.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: sister was cheated on by bf but since nothing physical happened they are still together. I say it's cheating, she says its not. What do you think?