This might not be what you are searching but this also has similar scene and some descriptions you described http://www.mangago.me/read-manga/seinen_wa_ai_o_kou/
Thanks! I've read this before, too, but it's not this one. But, I've found the one I was looking for. Here's the link if you're interested in reading it :)
http://www.mangago.me/read-manga/miraiken_de_ai_o_tsumugeba/
Chapters 4 and 5, I think?
Hello! Please help. I've been looking for this BL manga. I think it's part of a oneshot collection? not sure. but here's what I remember about the plot: they're best friends, and this guy with black hair is in love with his best friend. Then I think there's a scene where he confronts a girl who has a crush or is in love with his best friend, and he's jealous of her because she can confess. And then his best friend saw them, and he saw him crying. I don't remember the rest. but please if you're familiar with this, please help me!