Why doesn't Archer seem to have feelings for Rin? So, I just watched Fate/Stay Night Unlimited Blade Works for the first time.


  Archer is basically Shirou in the future of an alternative universe, right?


In the anime, Shirou mentions multiple times that he loves Rin or that he has strong emotions for her, at least. So why does Archer seem to be so "cold" towards Rin? 

I mean, shouldn't he be at least a tiny bit attached to her in some way? Or did he really change THAT much as a person, that he doesn't feel romantic emotions towards her? (Well in the end he DOES save her so he seems to care about her in some way. But, it still feels like there is too much distance between them throughout the whole series)

I mean, technically, should Archer have had emotions for the Rin in "his reality" or not? What happened to her?

Sorry for all the questions. I will look for more content of the "Fate" series, but my curiosity is killing me and I may have missed something since it was the first time, watching that anime, for me. :D
I think there’s a lot of hints that Archer actually cares about Rin and they’re bound to one another but not as a lover or romantic kind of love. It’s more like loyalty. He respected her as a servant respecting his master. The most remarkable moment I’d say is that in Episode 9 of ss2. Archer after was convinced by his old self,Shirou. And was beated (not physically but mentally) he then said “If she(Rin) was more of a heartless person, I’d not turn back to be my old self (who believes in Hero of Justice)” Hence, Tohsaka Rin plays huge part in Shirou development as a person and also as a human being who believes in his ideal heroism. 

Archer isn’t cold to Rin if you watch the anime carefully, he just has ‘Kill Emiya Shirou’ as his first priority. To do so, he can’t let Rin help Shirou gets Saber back and remains the alliance between them. After his betrayal, he still protected Rin for multiple times. Making conditions with Caster, Shinji and Gillgamesh to postpone Rin executions.

Though, if I were to say, it’s not like there’s completely non-romantic moments of them. Sometimes Archer seems to attract Rin passionately by his sly personality and his looks as well. In fact, the reason why Archer doesn’t show any fascination towards Rin that much because 1. She’s 16-17 years old Tohsaka Rin, it was mentioned in both VN and Anime that Archer sees Rin as a child/ girl only. Not as a lady. 2. She already has the Shirou that is his present version beside her. It’s kinda weird to start Romance with your young master when your old self is already in love with her. Not to mention Archer has already decided to erase his existence by killing Shirou so why bothered? If he has feelings for Rin, it must hurt and is hard to leave without regrets. So... yeah.