Wow. That piece was powerful.
Sometimes young guys do feel like they are invincible, & as such act accordingly. Through their own arrogance, it's the attitude of "It'll never happen to me". Sadly more often than not, life has other ideas.
To love someone that much, & find the only way you can shock them enough to get them to change is to tell them they are HIV+ must be heartbreaking. Tiff did a fantastic job writing that, you could almost feel the emotion leaping off the page.
For me the interaction between the characters was spot on, & very well written. As for the ending, well I kinda liked it being left open the way it was. Leaves you wondering, what if?