She might just have the BF because it's socially expected of her.
She does appear to like the other girl quite a bit, but seems to be balking at the girl-girl issue, that's at least my impression.

She already have her bf but flirting with other person.

Oh girls named Youko
They always keep fucking up things around them apparently

Nothing good can come between those two, Tatekawa is way too much selfish, i can understand why she got upset at the beginning but girl you need to understand that not every girl is a lesbian, Youko only see you as a friend and to be honest i fail to see the problem. I'm always happy to see Yuri but here it feel wrong here plus the fact that Youko doesn't seem to understand that her acts have consequences. I'm supossing that they will both go over it but i'm not a huge fan of this pairing.

The No pages curse continue