Not all persons can accept Paul's ideas about widow/widowers remaining single. GOD did not create man and woman to be solitary and live apart.
It wouldn't have been the scandal except it was a cheaters website. Meaning the thought took place in his heart and he stopped it at that point if he is being truthful. A sin most persons at some point commit and may not realize it as being such. As well thinking and doing is two sins thinking is one doing is another.
In his case? It sounds like he doesn't want to be alone yet doesn't want a commitment likely scared to commit to a permanent relationship due to his previous loss. A persons own mind can play some nasty tricks with some strong emotions in that respect. If he gets and accepts help he will likely be OK. Personally since no physical sin took place I think he should have kept the matter between himself and The Lord and simply sought out professional grief counseling.
Not credible; AM is an adultery site for those interested in sin, specifically adultery. Had he been interested in companionship he would have used some Christian matchmaking service. It is more likely he was involved in pornography, and one thing led to another.