Youngest son had the original in September of 20. He did not catch the alpha/delta version the rest of us got in May of 21.
I just spent quit a bit of close contact with someone who had the omicron version, and I didn’t get it.
So, it’s not as simple as “new variant you can get it.”
Multiple possibilities:
1) You did not actually have the virus enter you even though you were exposed to it, therefore could not have been infected.
2) Your previous immunity allowed your immune system to immediately recognize it and you were immune.
3) You did get infected but it was very mild or asymptomatic as your immune system was able to counter the infection faster due to exposure to a similar virus