John loved Alex,
Alex loved John,
You can't tell me otherwise--
I love it xD
And like-
If you need more proof, look at Alex's first letter to him,

Seriously, the first sentence specifically states:
"Cold in my professions, warm in my friendships, I wish, my Dear Laurens, it might be in my power, by action rather than words, to convince you that I love you."

They were gay for each other.
I rest my case.

(I have literally no idea why I wrote this xD
Just don't question it--)