What should i do need some advice?

ok...bear with me please im coming down from a panic attack, still kinda in progress but no where near as bad(writing this is helping) sorry for the wall

anyway the background, im 23, and she is 22. we known each other since high school and have been "friends." both of us are attracted to each other. we remained just friends until my 2nd year of college when we had a lil make out session. after that communication has been kinda ehh until recently.

When i like something, i tend to attempt to surround myself with it, now when i mean that like if i have a friend or someone i like i tend to gravitate to them, not on a smothering level but more on a we talk on a daily basis kinda deal not to bad. im not constantly calling or msging people. but ill send a "hey" randomly during the day. but recently i noticed over the years ive noticed a pattern with her. the more i try and talk to her the less communication there is, but if i only talk to her lets say every other day or every few days everything is cool.

for example, after the entire college make out session, i never got a response about anything after that, it wasn't awkward or anything. we both had a good night and knew exactly what we where doing. no drugs or booze involved. but anyway after that it was like a couple months of not hearing from her...which is fine i didn't have a problem i was away at school.

PRESENT: ok recently about 1-2 weeks ago, she pokes me on facebook, so i poke her back and see that she is currently on. i say hello and we catch up a bit, decide the next day we will go to breakfast and a movie. the day was awesome we both had a good time. now following what ive learned about her over the years, i am controlling myself in the communication department. its working...it REALLY is... we talk randomly throughout the week but its controlled to the point of a couple days with not hearing form each other.

so 2 days ago, i hit her up on FB again as she was on before i went to work, and we made plans for another breakfast. we ended up not having breakfast(she overslept) and had lunch instead, we didn't have anything to do for the next 2 hours so we went back to my apartment to watch tv/movies. this is the FIRST time she was ever in my apartment/house. my 2 other friends where over which was fine, they left after like 30 min of hanging out and it was just us. we laid on the sofa watching tv for a bit, until she said "im so tiered" in which i was took as a key to snuggle up to her. we did and she pretty much fell asleep in my arms for about 30-45 minutes before she had to leave. it was a great day, im REALLY sure she is in to me now. but the problem is i REALLY REALLY feel like im going to **** this up.

i hit her up today with a text of just "hey" and got back a "hey" instantly. but no responses after that.

and its killing me not to text her again. this girl is really important to me and i don't want to lose her again for like a year and half. what should i do, should i just come out and tell her how i REALLY feel or should i remain with my current situation even with the lil panic attacks as its working.

note: we arnt a couple atm, we are just kinda "hanging out randomly" and im in no rush, but what im getting at is im going insane controlling myself almost to the point where i am losing massive amounts of sleep. hanging out, kissing, snuggles and what not. havnt made the move to sex yet tho(not really in a big rush) i know it will happen if we keep going tho