Do I say something or do I let it die out?

Not really sure what to do, do I tell her to back off a bit, or do I just let it die out?

I'm almost certain she does, based on the way she looks at me, but also by how last night she ditched her boyfriend to come to speak to me. She also leans towards me as we speak and her head is leaning to the side and down.

I am into her, but I would never go for her so long as she's with him.

How can I put it to her kindly? Or do I just let her feelings die off?
Do I say something or do I let it die out?
Post Opinion