so as said in the title. am I the asshole for accidentally grooming someone on discord?

for context, i made an online friend on discord (i was a minor too) we made sexual jokes ,but I only did them thinking he was the same age as me. (he had his age in his bio) but then. fast forward a year. he's still 13. then fast forward another year, he tells me he's actually 14, when I was 15 turning 16,,,,,, , HELLO???

I started getting suspicious when he stayed 13 for two years ... 😔......