Congrats on 3 years!!! That's awesome.

Reason #1 is your self esteem. You have learned how to be strong and deal with life as it comes. You (like everyone) deserves to be treated well and with kindness, INCLUDING AND ESPECIALLY from you. Purging once doesn't mean a relapse is imminent, but it does mean that you're feeling something strong and should be looking at it. Do you have a T? Do you know what is triggering you? Do you have a self-care plan? (when I feel triggered I will ... take a bath and read a book with scented candles, put on my headphones and go for a walk, put on silly music and dance in clothes from the 1980s - whatever works)

Reason #2 is your health. Teeth, blood vessels, blood pressure, electrolytes, heart, bones - all are affected by b/p

I'm guessing in 3 years you've figured out a lot of tricks on how not to purge. My foolproof one is to take my (very expensive) medication when I want to binge. I will not throw it up (too expensive and for all I know, dangerous) and thus, my binge is halted b/c I won't binge if I can't purge.