Why did he not bite the bullet and confess to his congregation in person and come out?  That only begs the question:  Did he know that his own rantings and ravings against gays and gay marriage would not be accepted by his congregation? Yes. He helped create the environment of gay hating, and it turned around and bit him. The board of his church fired him yesterday (press release), according to CNN:

On Saturday, the board ousted Haggard from the 14,000-member church, which he founded more than 20 years ago, citing his "sexually immoral conduct."

My, such tolerance in Jesus' name.  

WWJD?  Jesus would not have fired Haggard. Acts 2:37-39:

When the people heard this, they were cut to the heart and said to Peter and the other apostles, "Brothers, what shall we do?"

Peter replied, "Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins. And you will receive the gift of the Holy Spirit. The promise is for you and your children and for all who are far off--for all whom the Lord our God will call."

But not the New Life Church of Colorado Springs (website) which was organized for the purpose "to know, worship and obey God according to the Scriptures."

Is Haggard a hypocrite?  Yes. Is his church? Yes.

And so it goes.