Short version:
>I like this girl
>She motivates me to do good stuff like going outside more, reading and going to the gym
>She only seems to see me as a friend
>If i confess to her how i feel i might risk losing this friendship and my motivation
>but i can't stand this shit anymore (and i swear to god if she get a boyfriend...)
Also we went to the movies today and when we arrived at her home i asked her if she wanted to chill. She said "no sorry, i still have stuff to do". It was like 23:59. and she is free tomorrow.
But she was the one to ask me to go to this movie.
It's so weird, it feels like she want's to be good friends but at he same time wants to keep a distance. I already spent a night at her place and didn't do anything weird so what's the problem? She could have said sure but not too long and it would have been fine.
It doesn't sound like she is romantically interested in you. Her having a boyfriend or not is probably irrelevant in this case.
But the only way to find out for sure is to be more assertive and more clear with your intentions. No that does not mean outright telling her that you love her.
The faster you ask her, the faster she rejects or accepts you, the faster you can move on with your life. You potentially losing your motivation is not her problem. Thats something you should do on your own.