Should i ask this girl out?

My bestfriend recently broke up with a girl I have a crush on. I had a party two Fridays ago and we've seen each other just about every day after that. The only problem is, so has my bestfriend. I was there with her for a few hours alone on a Thursday and later that night they broke up. She takes forever to text me back. And I feel exhausted chasing her daily. I want to tell her so badly, if anything only out of curiosity, whether she likes me or not. She seems just as touchy or more with her ex-boyfriend. But when the two of us talk, we get along really well and he goes into the shadows. That can be said vise versa. I noticed last night she was a little bit more dressed up than she usually has been, and I distanced myself somewhat purposefully to get her curious. We were supposed to go to a party together on Sunday night (four nights after them two broke up), but she opted to go with another friend (not her ex, he was at the beach), knowing I have a crush on her and being "sketched out" as her friend put it. I was so upset that she said that we're just friends and decided not to go, even though I think we might have hooked up. She also mentioned to her ex-boyfriend wanting to see a certain movie. After saying that she kind of put her head down and smiled, I think she was looking at me from the corner of her eye. But, I'm really sick of guessing, and I don't know if what I think are little signs that she might be interested are really just bullshit. Should I stop calling her? Is it a hopeless cause? It's hard to be alone to ever tell her I like her, should I wait that long?