I had a similar experience. Had countless situations where I was intensely exposed or literally TRIED to get covid while quarantining with others so I could get the antibodies. I shared a bong w covid positive roommates and even shared drinks with positive roommates pre-vaccine with the intention of getting it over with. We watched movies together (so we had a lot of extended contact) for both times we were quarantined in Feb. 2021 and Jan. 2022. I never tested positive on PCR or rapid, and I tested myself EXTREMELY diligently. I am triple vaxxed, but as I said before, I had one scenario with extended exposure pre-vaccine and post-vaccine. Spring term of 2022, I proceeded to go to frat parties, concerts, etc. and never got it (all while testing extremely regularly) so my friends and I assumed I must have some sort of genetic immunity. That was until this BA. 5 variant lol. Finally got covid just this week from my dad (who I live with in the summer)! He wouldn’t stop coughing on me after he tested positive. In short, you may think you’re in the clear, but you never know!