Like i think out of the wrongs they both did, faking that you were cheating on your partner is the worst vs the lesser evil not being able to give enough attention to said partner, when that said partner did not communicate that he was feeling neglected ╮( ̄▽ ̄)╭
It's not just not giving enough attention, it's not acknowledging the relationship except when it's just the two of them, going on marriage dates with women and returning with lipstick on his clothes, acting like he doesn't know him when they meet outside, and calling him "childish" when he communicated how he was feeling about it. After that it was pestering him through phone calls and messages to get back together when they broke up. If "not giving enough attention" was all you saw, you might want to re-read.
"Let them have lots of baby makin sex" y'all need to stop being so baby crazy.