Your boyfriend was scared of a deer? A deer? Really? That's like being scared of a fluffy little bunny. Deer are not that smart, and not at all violent.
We have problems in a nearby forest/park every spring. People like to jog in there, but during mating season, the stags get bloody aggressive, and chase people around. Some people even got attacked and got hurt pretty badly. Don't fuck around with anything that has antlers!
At a college I considered going to, part of the tour was to warn us to be very, very scared of deer. Somebody gets attacked about every year, and that year someone had gotten killed. It's mostly people who saw Bambi and want to pet the baby; they'd never seen a deer in the wild before. (A lot of people from countries without the things go to that college.) The guy who died was trampled by a doe, so you should be scared of anything that has antlers or babies.
I'm also a vegetarian because I'm opposed to fake meats.