Search Results: my boyfriend found out that i cut

I started talking to this girl in my physics class that i had a crush on. We have a lot of common interests. She is really cute. I am kinda shy but it was easier because we were both shy. We started talking on fb first then i started sitting with her in physics. She says hi to me after every period and she says my name when she says hi. It took awhile for us to get comfortable talking with each other. She sometimes acts helpless, which i find adorable.
One time in the hallway i was walking to class and she randomly trips and kinda like falls/runs into me and grabs on to me. There wasn't anything to trip on so i don't know if it was on purpose, but then she started talking to me. She isn't afraid of physical contact either, like i mess around with her sometimes and we do play around and she seems to enjoy when i tease her of play with her.
I asked her if she had a boyfriend while i was talking to her on Facebook one day and she said "right now?, no". I think i made it kinda obvious that i like her. Just yesterday was the weirdest thing. When i walked into class she tells me she cut her finger and asked me if i had any tissue. i said no, but i went to go get some, when i got back to calss this girl gave her a bandaid. I went to go sit next to her and she asked me if i could put the bandaid on her finger. The cut wasn't really bleeding much at all so i dont think the bandaid was necessary but that didn't stop me. It was like the cutest thing ever to put this bandaid on her finger. I dropped the bandaid at first and she laughed and picked it up, and i held her hand and put the bandaid on her finger. It was kinda awkward cause a lot of people were watching. Well she asked me to wear matching costumes with her on halloween. I found out she is back with this guy ( he isn't very attractive and he is fat :p). Well I don't know why she asked me to go matching with her if she is back with her boyfriend.
I want to tell her i like her but i dont know if is should