Thiswayout, it must have been important for you to tell your t about this, even if you have regrets.
Therapists are people too. What you did in the past is only history. Today is a new day we can live in a new way.
Think about why you told her about this so next time you see her you can explain why you told her. Maybe you just wanted to come clean with her and not have that nagging at you during therapy. Now she knows and you can let that go and so can she.
Maybe she really just wants you to go by that. Maybe you really want to go beyond that.