He just didn’t want to be the cause of it happening, and Bayleigh and Da’Vonne aren’t in the majority alliance.
The question is, will any amount of talking between Bayleigh and Tyler sway him into wanting to keep her?
Tyler is in a safe place in the game at the moment, so for him to stick his neck out to save someone who may actively target him isn’t really a call I’d expect him to make.
Personally, I think the fact of the matter is that neither of them is able to move past what happened in Season 20, and Tyler has secretly wanted Bayleigh out of the house for some time.