my take is simple if she is not opening her legs then she is out, hell you do ahve some woman friends, but mostly because of social circles and most of the time you don't even give sh!t when they are there, so even less if they are not
problem number one that is for the op and anyone who still have this kind of thing, ther eis not feeling, you should just try to have sex with her, threat her like any other woman, if she can't see you diferently or don't want sex, that means she is atracted to you with means its time to move, woman love "male friends" because that supply her need for male atencion, with the worse case, she don't need to put out, so best for you is cut your loses and move on, and everytime she try to talk you are busy, hell toss even the, sorry i'm with a girl now and I don't think its right to spend time with you, do everything to cut her,
also note normally woman will go for extra mile to keep you around and she will try to string you for a time, but still is better to cut she had her chance, not its over