Hi Danerz & welcome.
I don't understand this girl.
She denies that she is losing interest in you, yet she is 'flirting' with other men, to the extent of discussing potential sex & saying that she no longer found you attractive.
Unfortunately, this can't be a huge surprise to you, because you had already sensed it.
Yet she wants to stay with you.
Why?
What is it about you that keeps her with you, when she finds other boys / men more attractive?
Find out.
But it looks as if you and sala are both right.
You love her desperately; she seems to be losing interest.
Find out the truth, then make some decisions.
She should not be leading you and other men on; you shouldn't be putting up with doubts and untruths.
