If I were you, I would immediately cut off all forms of contact with this person and possibly pursue legal action (although I know that lots of survivors of sexual abuse/harassment avoid doing this because they don’t want to be re-victimized, made to prove what they cannot prove, etc. and obviously that’s fine).
I don’t think you necessarily have an obligation to do anything further than that, and I think that continuing to worry about this situation will just draw mental and emotional energy from you unnecessarily.
I’m really sorry that this happened to you, babe. That person is a shitty human being and I don’t want you to think for even one second that anything that happened was your fault or your responsibility in any way. xoxox