@srjoanna You didn't ruin him. There's a 2 year sleep regression and he was also likely too young to transition out of the crib. I know he climbed out and it wasn't safe, but had you tried flipping the crib around so the short side was against the wall and the tall side facing the room (so he couldn't climb out?) was he in a sleep sack?
I'm all for safe sleep, but I also know that many 2yo are too young to transition out of crib. Their prefrontal cortex is rly not developed at that age so they can't understand the change properly.
I also don't think typical sleep training works at 2yo. They are too old and they can go for hours. I had a friend who went through this problem and it took a long time, but they basicallt phased out the sleep assistance rly slowly. Started with cuddles, then she moved to a chair beside the bed while holding his hand, then the chair moved a little farther, etc. She had to stay at the door for a few weeks while he fell asleep but within 2 months, he was back on track.
Wtv you decide to do,good luck!