Haha the friend shouldn't woryy he'll probably end up being the fall back for that rival girl lol
@Macmeaties dude Im sorry to tell you this but thats just how it is in real life most of the time, statistically most people are hetero - vastly more people, google it - and so most romances/rivals are hetero. Plus you may not have found them but there are a ton of love rivals that arent hetero, go read any of the thousand stories that have girls who want to steal the FMC away from the MC (girls can be bi too) - if you want a guy they're harder to find but still out there - either way if its not what youre looking for then why bother reading it.
This is one of the nicest romance mangas Ive seen in a while, its not got much to complain about yet.
If you want more men on men then search shonen ai or yaoi, there are plenty of stories that are more like what youre looking for.