It´s because of things like this that I´m so glad it´s extremely hard for me to fall in love... It seems like an awful experience...

Personally I find crushing on someone who is not available quite pleasant actually. They are in a relationship so that is that but the crush still enhances how much I enjoy their company which is nice. But yeah if you are the type to be sad if you can't have them I am sure it can suck. (And here the other isn't in a relationship just interested in someone else so she has more hope which might make things worse.)

This one - https://dynasty-scans.com/chapters/up_and_down#2 - says it all for me.