Both were bad choices, but he choose the worst one of them.
I agree but it’s not like he has the luxury of telling the truth anymore, no matter his feelings yurea is fucking crazy and has zero regard for human life, along with knowing he can time travel at will he has zero security no matter where he goes unless he begs what’s her face to go back in time, and all that does is return her to default settings of “kill him immediately” whenever he travels back to his original time.
He’s an idiot but even if he wasn’t there is no way to avoid this situation without someone capable of killing him in an instant becoming very upset, that’s a risk he can’t take lightly no matter who he has feelings for.