I really feel it takes 2 to clap .
Probably in the case of a 8 year relationship, its good for you to self reflect rather than just be angry.
Be happy that you dont have to spend the rest of your life with that loser . He gave up, he wnted to go fuck someone else, dont let his idiotic comments about you not being by your side affect you.
If you meant something, he would have tried to fix it. So just let it be.
However, sometimes, the woman needs to try harder as well. So some self reflection would be good. Did he seem more distant ? More stressed at work ? Did he try to talk to you but you brush him off ? Were you too comfortable and took him for-granted ?
Maybe he is just an asshole.
Who knows ? I try to eat dinner with my wife everyday, even though both of us are having our own corporate careers. If we can make time, I really wonder, why both of you didnt make time