Feeling lost. ...need to vent!

Hi, I'm 23, recently I've lost a lot weight (85lbs). People have been telling I look great and at work friends tell me how I'm blowing up.

Always avoided girls before in general (especially at work), until this girl at work introduced herself and offered rides. She and I had a good amount of things in commons and i definitely felt something as first started to get to know each other. I Started to enjoy taking to her at work later even fb messaging. Never before tried messaging a girl to start convos but I did with her and she would engage in the conversation. Got to the point where she was stressing about a test and I tried reassuring her she will do great. She replied if your right I'll buy you lunch. I really thought she was interested in general and so did few friends.

So the next time we were working together I decided to ask her out.

She seemed to be in a great mood, she was trying to make sure I notice her ever chance she got in our large retail store. She came to ask for my help and it was just two of us in the back half of store with an awkward silence for a second thought to myself now or never. Told her "I have to tell you something that might be weird" she said "if its weird don't say it" "I have to in order to get this off my chest" I said quickly. Then just asked her if she wanted to go out sometime to which obviously she said she was too busy.

I should've known she wasn't interested especially since she told me a while ago about another guy who treats her really rude after she said no to him asking her out and I was the only one starting conversations on fb.

I don't hate her for saying no just hurt. What hurts more is we don't engage in conversation like we used. I don't message her fb but still talk her in person every chance I can. The worst is how her end of the store seems to treat me differently.

Feels like I lost a close friend even though we weren't that close for that long. Now first time in my life I want a friend like that but have no idea how or where to look.