Hey,
I'm going to be hard on you but you need it. You say you are friends with this girl but you aren't much of a friend to her. You have been lying to and keeping secrets from her since you met her (the secret being that you like her) Lying is a typical behavior of "nice" guys.
Here is a paraphrase from the book "No More Mr. Nice Guy"
"
Nice Guys seek the “right” way to do things. In my case, looking outside to see whose “doing it right” before doing anything.
Nice Guys have difficulty making their needs a priority.
Nice Guys are dishonest. They hide their mistakes and say what they think people want to hear.
Nice Guys are secretive. They are so driven to seek approval they will hide anything they believe might upset anyone.
Nice Guys are manipulative. They have hard time making their needs a priority and have difficulty asking for what they want clearly, so they feel powerless and result to manipulation.
Nice Guys are controlling, in order to keep their world smooth.
Nice Guys give to get, and expect some kind of reciprocation.
Nice Guys are passive-aggressive.
Nice Guys are full of rage, a rage which tends to erupt at some of the most unexpected and seemingly inappropriate times. This is the ironic part. It's my "Nice Guy" behavior that's creating this rage inside (and there's a LOT of rage) that's resulting in very "Mean Guy" behavior.
Nice Guys have difficulty setting boundaries, and instead feel like victims.
Nice Guys are attracted to people and situations that need fixing.
Nice Guys are terrible listeners because they are too busy trying to figure out how to defend themselves or fix the other person’s problem.
Nice Guys form relationships with partners who are “projects” or “diamonds in the rough.”
And Nice Guys tend to swing back and forth between the nice side and the dark side.
"
There is a difference between someone who is nice and is a "nice" guy. A "nice" guy is the above. A person who is nice is someone who treats others with respect and expects the same in return.
The girl isn't attracted to you. Asking her out would be a huge mistake because she would say no. The "friendship" would be lost, which might not be such a bad thing.
I strongly, strongly suggest working on getting rid of your "nice" guy behavior. It doesn't mean that you have to be an abusive jerk to get women attracted to you. Most men believe that those are the only two options. Both of those options aren't smart ones because they both lack emotional maturity.
The third option is to be respectful, confident, honest, live with integrity, strong, take no sh*t and so on.
I just wrote an article on my website about turning a friend into something more that you should check out.
If you have any questions, please post them
Alex