Tooth cracked 2 years ago?

I got popped in the jaw by my dogs head a few times when he was a puppy. Anyways, one day I noticed a tooth in that area was very sensitive to cold drinks. I gave it a couple days, but then it went away, so I didn't bother to see a dentist. fast forward 2 years later that whole tooth breaks in half. The shoddy dentist I went to scammed me and couldn't tell how long it was cracke or if it even was cracked, but they did say it had a cavity. Personally i think it cracked, then that's what caused the cavity, but why was it only sore and sensitive to temperature for a couple days, then fine after?

Tooth cracked 2 years ago?
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