This didn’t happen.
https://en.wikipedia.org/wiki/List_of_elected_British_politi...
I think what you are referring to is the tory MPs who defied the government and voted with the opposition on a single vote.
At that time literally one of them permanently defected, very visibly crossing the floor. Many of the rest were booted out of the parliamentary party by Boris, only to be readmitted later (including my MP, who I do not vote for).
There were two or three who joined minor parties, and a handful ended up in the Lib Dems afterwards, but there was never a mass defection to the lib dems, who only have 15 MPs now; 15% of the 2019 Tories would be over 50.
Either way I think your summary misunderstands the reasons all of that happened, and the principles behind it.