I guess. Or he really didn't think he had an addiction problem. Most addicts are in denial they have a problem.
Oh, I totally believed Monica, and in 1998, I was one of you wingnuts who said, "Subornation of Perjury" like that was a real thing. Between you, me and the lampost, Clinton did commit a crime, just not one serious enough to warrant removing him from office. But here's the gag. Clinton never claimed he was immune to criminal prosecution because he was president. That's why he decided to pay a fine for lying about Monica.
That said, When Clinton left office, I was pissed off that he lied about an affair.