but the cover is the friend right, not the black haired guy ╥﹏╥

I want the black haired guy to be the one he ends up with ┗( T﹏T )┛

No dear. The cover is the omega with the black hair
It's a black white manga after all.

As we can see, the omega's friend have a light hair color and long. ╮(￣▽￣)╭

The couple in the cover is the third couple. An omega and I think the friend’s brother. You can see a preview here.
https://www.cmoa.jp/title/149550/