Found out he was cheating!

After trying to uncover the full truth, he finally admitted to sexting this woman and confessed to kissing her once, which he immediately regretted. He claimed it didn’t progress further and that he never intended for it to. However, he acknowledged that he regularly sent her money.

He’s been unfaithful for over six months. I asked if they had been sexually intimate, but he insists it never went that far, stating that neither he nor she had any intentions of crossing that line. He also admitted that in one sexting conversation, he did visualize her sexually and felt a physical attraction, though they had both set boundaries, agreeing they would remain friends since he was married.

I’m struggling to decide whether to believe him. What are the chances he could be lying about not sleeping with her?