Realistic Life vs Show/Book

Maybe this is obvious but I don’t have a lot of people to discuss this show with.

How is River single? He’s obviously fucking beautiful (right? It’s not just me?)
How is he lonely?

His character is so beautifully written, my heart constantly hurts for him.

Did he truly have feelings for Sid? Idk why I have these thoughts but I am curious for other fans think.

Can someone help me understand? I’m more familiar with the show and have the audiobooks

One of my first times posting, don’t be mean please!