Do I think we are the only life in this multiverse?
No.
I once calculated the likely number of planets with intelligent life using the Drake equation (which I accidentally called the Ernst equation in a previous post). I came up with two.
It’s not meaningful — I dramatically underestimated the number of planets in the universe — but I figure getting a number so close to one was like flipping a bat and landing it straight on its head... and then trying to knock it down with a second bat, and having it balance on the other bat.