Is this regret?

As much as I'd be miserable since we just had a child I'm considering leaving. He cheated and i gave him another chance to show change and why he wants me to stay. It's been almost a month and he is still the same. Quiet, doesn't reply to messages in an appropriate amount of time, when i try to start up the relationship conversation he wants me to calm down essentially. Would it be wrong of me to just end the relationship or have i really not given him enough time? I think he should basically be on his hands and knees(figuratively) trying to convince me to stay.