painful friendship

For the better part of 9 years, tharn and type have been the best of friends. Meeting at the age of 12, on the soccor field, the two hit it off right away. They didn't know how but when they played even on that day, it felt they had been playing for years, then to there surprise type then started tharns school the very next day. The two become very close, by age 15, they end up raiding tharns parents alcohol, getting drunk, type tries to kiss tharn, not wanting to take advantage of him, tharn refusing. Type then placed tharn really in the friend zone, not thinking he had any feelings for him, unaware, tharn liked him since they first met, he just was being a gentleman.
After a year, type then gets into a relationship with another not knowing tharns true intentions.
Seeing this, tharn stops being a gentleman, thinks if he did take advantage of type, he would have been his. The two then started to drift a bit during high school, type had his man while tharn became somewhat a bad boy.
By collage, the two still are close and end up in the same field, engineering.
by there age of 20 something occurs that changes there friendship.
what shall it be? only by reading will you know.