Your reaction is understandable.
I cannot comprehend how marriages stay together after cheating - but I know several that did. One was a good friend, well paid professional with great career ...., cheated, left his wife and kids and married his lover. After a few years he got religion, realized his sin, ... and somehow remarried his first wife - totally faithful. They were married for another 40 years before he passed away in his mid 80s. You never would have known this about their marriage(s).
Christ *was* crucified between two thieves. One was allowed into the Kingdom of Heaven,the other one (presumably) was not.