OMG. Poor Diego. I don't regret making his route my main route.
The bad ending absolutely made my blood boil. Not to mention that to some people - as I've read in the comments below - it was obvious that Kyrex was Diego's ex, but it wasn't obvious to me. But I suspected it as soon as he showed up. Though that still is a blow to my self esteem and my self worth, even though I didn't get the bad ending the first time around, because I didn't like Kyrex in the first place and I had a hunch that it would be a bad decision to have sex with Kyrex, but with hindsight I can see how one could deduce that Kyrex is Diego's ex (namely that Diego isn't going to the gym anymore and how Kyrex threw Diego away).
Anyway, I now have a big reason to hate Kyrex' guts. And to mention that someone below would date him over Diego. Like, Kyrex literally emotionally ensnared Diego, had his fun with him and then threw him away like trash. Who would want to be with someone like that?! Perhaps if you're in it only for the fun, than say so beforehand. And if I was in a situation where a person, with whom I'd only have casual sex, would fall in love with me I'd not throw that person away, but instead I'd be concerned about them and either properly break up with them or give them a chance.
BTW. I don't see myself as someone who would be having casual no strings attached sex, I want, no I need, some sort of connection with that person and like that person's personality (i.e. I could see myself having sex with a friend). Also I wasn't aroused at all during Kyrex' sex scene because of that and because I already knew who he was. (I still think that my sexuality is too complex for a label, but if I had to be labeled then male preferring demisexual would fit well and it's a label I'm more and more comfortable as time passes.)
P.S.
I can't wait for Lukas' route. His smile is just...
P.P.S.
Greetings from Czech Republic.