Forgive and Forget

So I watched this movie called 'Forgive and Forget' that was made in 1999 for Scottish television. Here is the plot summary from IMDB:

'David O'Neil (Steve John
Shepherd)[ed. note - hubba hubba], a
plasterer and mature student Theo (John
Simm) have been best mates for fourteen years and
are practically inseparable. However, their friendship has become strained as
Theo is about to move in with his long-term girlfriend, photographer Hannah
(Laura
Fraser). A raging jealousy awakes in David and he
starts scheming to break up the loving couple using Hannah's insecurities
against them. When the couple eventually separate David is in a quandary about
his next move and is forced to confront his long-hidden homosexuality and
feelings towards Theo. Eventually, David decides to reveal his sexual
orientation and deep love for Theo very publicly by arranging for them both to
appear as guests on Judith Adams' (Meera
Syal) talk-show, "forgive and forget", with tragic
consequences for their friendship and David's family.'

[May contain spoilers!] The movie starts off light enough. You can tell something is going on with David concerning Theo, but not right away. Finally, you see that David is hooking up with a guy and his internal conflict is revealed. You feel sorry for him, until he pulls that trick on Theo and his girlfriend. This was hard to watch, but intriguing as you can identify with David, but that conflicted with he did, as it was rather mean. So of course, the girlfriend gets suspicious, and her and Theo's relationship spirals out of control. You know that it is going to come out what David did, and you are intrigued to see how it resolves itself.

The movie tricks you in to thinking everything is going to work out [at least for David and Theo]. But then you get to the end, after he outs himself, and it becomes kind of dark and heavy. The ending left me perplexed. David has a huge fight with Theo, yet at the end you see him on his back in the grass, smiling, saying that this is the best day of his life.

This confused me. Was he happy he finally came out, even though he lost his best mate and family? Or was he happy that he finally saw the real side of Theo? I'd like to think it was a combination of the two. Otherwise it makes this a dark and depressing movie.

Over at IMDB, there aren't many comments. In fact, one says this movie puts the gay rights movement back 50 years. It would be a depressing movie for a gay youth to watch; showing that by coming out you will be physically and emotionally hurt by friends and family. But I like to think that this wasn't the intention of the movie. I tried watching the director's commentary, but it is more focused on the staging and set up of shots. This is an interesting movie I would like to get other people's opinions on.