Girls, I'm confused about this relationship?

Me and my girlfriend got into a relationship fast, and I was always putting all the effort I could into showing her I was serious about her. We entered the relationship with the mindset of being serious or long-term. A few months later, I'm still stressed about this relationship. I feel like she's not putting in the effort. I recently spoke with her, and she told me that I could tell her whatever I wanted. When I do, she's just like, "Whatever," "okay cool," and makes it sound like she doesn't care. She said she's always here for me, but she doesn't act like it when we're on chat. I don't know what to do. But honestly do feel she loves me.
Girls, I'm confused about this relationship?
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