
1) be honest, tell her what you're going through. she might not be chill about it exactly but at least give her a chance to understand and come to terms with it and you can hopefully part amicably. 2) if you're not ready to come out to her, just break up for some other reason. say it feels like you're not really connecting, the chemistry is gone, something like that. it's probably not a lie, but even if it feels like a half truth, this is a case where it's justified.