I can't speak for Meet but Spaghetti's comment was under the belt. Betrayed partners often feel, in the initial stages after disclosure or discovery, a great deal of humiliation and shame. The common narratives around 'I'd never stay with a cheater' and 'At least I have my self-respect' can, albeit well-intentioned, create pressure in such a high-stakes situation, and at worst feel like victim blaming. When a betrayed partner wants nothing more than being safe in the comfort of their own home to process what is happening, being told 'Well, I'd just leave!' can feel awful. Betrayed partners' self-esteem is commonly already at rock bottom following learning of an affair; decision-making is hard, and having one's 'failure' to pack the cheater's bags or leaving to stay with one's parents / friends (where emotional processing will be public at a time when most will want, more than ever, to have privacy) highlighted by a comment like Spaghetti's, whether the affair is fresh as in OP's case or historic as in Meet's case, stings. It was neither necessary nor compassionate.
DAD, I've seen you on other threads on this topic, and I'm sorry for what you experienced. I agree that the best version of our lives probably aren't spent living along side the people who hurt us in the most cruel ways any longer than necessary. Our death bed reflections most likely won't rest on how great it was to dedicate another 30 years to the cheating spouse. But we might dwell on how such a decision has facilitated other things to take shape. I'm staying put for now, still hurting like mad following my spouse's disclosure of an emotional affair a year ago. Like PP's have suggested, I'm still processing and figuring out what I want. My partner is very grateful, feeling he's had a second chance and is in full reconciliation mode. Good for him. I'll let him know what the future holds when I'm good and ready -I've given myself no time limits or 'shoulds' or hypothetical scenarios. I refuse to be hurried out of or into any part of my life (including my home), for any reason. For me, this period has allowed the dust to settle, and for me see things more clearly (myself, him and, to an extent, her) to feel like I'm in charge of what happens next. I have a very different suite of choices now than I would have had if I'd thought of leaving last year, and I'm glad I have given myself the gift of time. It's got nothing to do with revenge being a dish best served cold, because I'm not interested in revenge, only for an outcome that will benefit the greatest number of people the most. I've thought of it a little like working a shitty job for a limited period until you're able to achieve 'the thing' you were aiming for all along. It's just going to be a bit different to how we first imagined it. But nobody will have died, and we'll still be reasonably amicable.