That's a pretty loaded title. I was in a relationship similar to this and therapy changed a lot of it. She might not feel like she can open up to you, maybe a past relationship left her with trust issues, maybe she has anxiety but pretends she doesn't, tons of stuff that she can work out with a therapist and then pass the good stuff on to your relationship.

It's hard to judge but I'm gonna say NAH with a side of everyone sucks. You guys needs to work through this, not fight against it at every turn. If you were really as available emotionally as you say you are, she might not hide things from you. This is a two-way street and should be addressed by a professional.