What if I told you I'm hopelessly in love with my girlfriend?
That sounds wonderful. Does your girlfriend feel the same hopelessly in love way about you?
I wish she was.
That must be difficult to be in a relationship where you don't feel your partner has as strong feeling as you do. You should try talking to her about this to see what her thoughts are on the relationship. Relationships are difficult and require work to maintain them.
I'll keep trying harder.
Trying harder to maintain the relationship is good. However, don't let yourself be the only one putting effort into this relationship. If she isn't willing to work to try to make things work, it might be best to just move on and find someone who loves you as much as you love them.