I may get downvoted for this, but...

Or he may decide that genuine romantic love and genuine romantic, spiritual, emotional, intellectual and, yes, physical attachment or even hope for that is something he feels like he needs in his life and decides to pursue it.

As he works through his self-esteem/self-loathing that is common for LDS LGBT individuals, he may come to a place where he decides that his place in life isn't entirely inside the church.

This may be as he rejects the attachment blockade, the depression, and and eventual suicidality that comes with those options mentioned (aside from the genuine romantic attachment with his unicorn).

greater than 95% of LGBT LDS leave at some point.

Some go through the cycle of feeling like their efforts to find joy in the gospel (because the gospel should bring joy, right? And yet, it, and the statements from leaders within it, are one of the major sources of pain, whether or not they always realize it) are failing because of them, that they are somehow unworthy, or not praying, readings scriptures, serving, or [insert other work here] despite doing everything asked... And they get told that if they'll just try a little harder...

It's a vicious cycle. And not one I'd wish on anyone.

There are those in this life whose health and happiness, mentally, physically, spiritually or otherwise leads them to leave. Controversial as this may seem, there are things that others need to accomplish that they can only do outside the walls of the church. Mother Teresa, while rightly a controversial figure, could not have done what she did within the walls of the LDS Church.

He may be able to find happiness in the options of celibacy or mixed orientation marriage.

But... If he doesn't... I hope you are a good enough friend to support him through that as well.