i want to let this girl know i will never stop chasing after her, and i will not break her heart
Most Helpful Girl
Even though that is SOOOOO romantic, you shouldn't be clingy or smother her. There's different ways you can tell her.
You can tell her straight out. If her birthday or holiday is coming up get her something she told you about in the past or something that only you and her know about. You can get a stuffed animal and put a special note on it (nothing to racy or sexual because it will spread around her friends) Or invite her out and casually slip it into the conversation.
The most important part of any of those is to read her body language and make sure she doesn't look/feel awkward. Trust me, she won't say no.0