I am starting to like this girl?

[Peter]

One of the guys who is part of our friends group used to have a thing with her.. never official.. never did anything as she's a virgin.. but she added me on facebook and we really hit it off, she asked me for my number i teased and give her it after she asked for it the 3rd time! She is really nice.. and just realised i may really like her when seeing a photo of her on facebook, i got that feeling... we text all the time now, she texted me in the morning to say 'morning' I would be too shy to do that!!
She seems to be interested well the signs make me think that.. I am 21 you may think I'm stupid asking about this stuff! but...

If anything does develop do you think it would be wrong of me to get with her?
even if i am beginning to really like her..

real answers please, thanks!