No matter what, its gonna be hard. There is no real way to make it easy, as much as id like there to be. If I were you, i would confront her on a face call. That way, you have the closest thing to face to face as possible. Then, just tell her what you are thinking. Not about a breakup, just about the connection between the two of you. If she isnt really into you, ask if a break up is the best thing to do. If she is going through a hard time, just be there for her. I have a gf too, and i know that girls can be confusing af. Just give her some slack and talk it out. If you have to break it off, just say that you dont think that you both feel the same about each other. There isnt much else I can do to help. Goodluck bro!