he sounds like a psycho. you should probably leave him.

Wait, you were going to get out and approach a wounded deer? You must not be or spend time with hunters. While you boyfriend picked a rather grotesque way to put the deer down; he did save you from yourself. Wounded deer tend to kick like crazy when approached or touched. You just don't get that close without a weapon. Its a bad idea.

I really, really hope you mean ex boyfriend.

you're dating a serial killer

Omg. I'm just sitting here and saying omg and omg many many times. This is just so horrible! :(

Depending on how hurt it was possibly the most humane thing to do.

While I agree that the smirk was disturbing, it's probably not a good idea to approach an injured wild animal. If it wasn't as injured as you'd initially thought, it could have attacked. Deer can attack people, and it could have done serious damage to you, especially if it was a buck.

He did good, it would have just suffered if he didn't, even if he enjoyed it (Or was relieved to release it from suffering)

He should have moved it out of the road at least, many vehicles can't just "drive over" a deer... I suppose that's a quick but terrifying way to end it's suffering. Maybe the poor thing was grateful for the light? Let's go with that.

I agree with simsgirlgem: if he will do that to the deer, what else is he capable of? Of hurting? You? He sounds like a scary beast.