Meh, I get that was how his mind was justifying it, but it wasn’t believable. He looked like a coward, again.
As for the sacrifice, he realized he was a coward and him and Poe screwed things up. So, like TFA, he got courageous at the end.
He’s either a coward, or a pathetic loser attached to Rey, just like TFA. I hate his character!