As I write this, Lifetime is showing some of their older movies as part of their "30th Anniversary" celebration of their original movies. "Obsessed" was shown back-to-back with "Her Married Lover". Both movies were about women who claimed to have had affairs with married men, while the men denied the affairs. Both movies were told in a similar style, too. I don't want to say more, because I don't like reviews with spoilers.
Anyway, I thought that was a clever bit of scheduling.
As for this movie, it was serviceable; neither great nor terrible. Not one I would watch again, though; it wasn't done that well. It was OK, nothing more.
I don't understand all the praise given to Jenna Elfman by so many other reviewers here. Sure, she was good. But not outstanding. In fact, I felt she was held back, not allowed to let her true personality show through. It almost did a couple of times, but then she was reverted back to being more like a dozen actors that could have played her role. She has been so, so much better in other things where she was allowed to show her sparkling personality shine. At first I though this might have been one of her earlier roles, and she hadn't learned to show herself as she is fully yet. But she had been in a lot of TV shows and movies before this. So I can only assume the director tamped her down a bit for this role. That's a shame; she is so very good when she lets her personality show.