A Daddy's Dilemma

I've been in a relationship with my submissive partner, Lily, for about two years now. She’s in her mid-20s and we’ve had a great dynamic going from the start. I’m a bit older at 31 but she always felt comfortable with our age gap. We both agreed that playing daddy was something special to us - it made things exciting and added another layer of intimacy and trust. Everything seemed perfect until about six months ago when Lily suggested we expand our play into more mature territory. She wanted me to take a role I didn’t feel fully prepared for, pushing the boundaries further than I thought she'd ever be comfortable with. My hesitation led us to some heated debates - I felt torn between wanting to fulfill her desires and maintaining the balance of power within our dynamic. Despite these disagreements, we continued seeing each other but the air was tense. It culminated last month during a session when things got too intense for me and I ended up being too rough with Lily because she kept pushing the envelope on pain play. She cried afterwards, not just from any physical discomfort but emotional hurt as well. Since then, I've been trying to figure out if we should continue this path or move in another direction. How do I reconcile my feelings while respecting hers? Should I let her guide us towards more intense territory or hold firm and maintain our status quo?