what the actual fuck lmao
this has got to be the worst justification for cheating I have ever heard
"well yea your communication was weak, and you already mentioned you are over-compensating for a prior relationship failure, and you're balancing a lot of priorities in your life right now, but OH WELL seems like enough of a reason to deadass cheat on you and have sex with another girl!"
what the actual fuuuuck
Like I know this is the boring answer because it doesn't make for good drama for a manga, but all of this could have been easily resolved with just some discussion and opening up to each other about their concerns and anxieties.
In other words, you should
100% BLAME THEM FOR THE CHEATING because of how abundant and available the non-cheating resolutions to this conflict are