AIO - she’s 19 and he’s 48

I (51F)just found out that my now ex (51M) has been in a relationship with a girl (21 now but was 19 when this started). They are on a fettish website listed as in a relationship. Some of the things listed there is daddy/daughter play. This makes me sick to my stomach. A 30 year age difference between 21 and 51 is just sick. He is her “daddy” now. I broke things off immediately after I found this out. It gives me creepy pedo vibes. I can’t unsee it and it is driving me crazy. AIO as she is legally an adult.

Edit: we were together when this started two years ago. We were together until two nights ago when I found this out.