((( Dustin )))
Of course it's for real; anything you feel is real.
How do you tell her? Well you just do. You might start by telling her you want to tell her something but you're worried or feeling uncomfortable about telling her. When you start talking to her about how you feel, you'll begin to feel better. It's important and talking about this can take place over many sessions and you can go on to other things and then come back to it (and any topic/issue) again and again.
I'm wondering if she told you about her boyfriend recently because she wanted to open the door for you to talk to her about these strong feelings she suspects you have for her. I think she's ready to hear what you have to say and to help you with it.