I [24 F] like to get outdoors when I'm stressed or upset. My boyfriend [26 M] thinks it's weird and unhealthy.

When I'm under a lot of stress, I like to go backpacking and camping alone, just for a weekend or something. I started when I was a teenager with a ****ty home life, I'd just go camping in my cheap pup tent, or sometimes without a tent at all on nice days. Just go deep into the woods around my family's house out in the country.
Over time, I got better gear, and now I've got a whole backpacking setup. I keep my gear in my backpack, so whenever I want to go, all I have to do is pack food, clothes, and a map, and I can be out the door in no time. I live in a city now, so I have to drive out to somewhere to camp. Usually a wilderness area in a state or national forest. I always tell my brother my planned route and when I'll be back.
I keep a camping journal that I only write in when I'm out in the woods, it's got a lot of soul searching and deep **** in there, since I generally go on camping trips to have some time to think stuff through. I wrote in it about my abusive family, coming out as bi, going through some scary experiences in college, having a lot of my skewed worldview shattered when I moved out of my small town, etc.
It's super cathartic, spending a couple days just thinking about survival, the little things like gathering firewood and building a fire to cook over, following a map, finding water, etc. Then spending the night somewhere, relaxing in nature with no distractions like a phone, or technology, or other people.
Most of my friends think of it as an odd little quirk of mine. They've all lived in cities or suburbs their whole lives, and think it's a little crazy to go spend a few days in the wilderness. But they think it's harmless, and just joke about me going off to cuddle the wildlife.

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Anyway, last week, something happened that shook me up, and made me want to go camping. I found out that someone I had thought of as a friend had been beating his kids. I was shaken up by the fact that there was another side to a guy who had seemed so kind and compassionate otherwise. I was also sad to lose a friend, because of course there was no way I could get past that knowledge and remain friends with that guy.
So I told my boyfriend a little bit about it, and told him that I'd be going camping. It wasn't like I was cancelling any plans with him; he was scheduled to work over the weekend anyway.
He said that he didn't want me to go when I was upset, he didn't like the idea of me alone in the woods for days when I was upset and shaken up.
I said that going camping was my way to deal with being shaken up, it has a calming effect on me, so while I may still be sad, I'll be in a better place to think things through.
He said that it wasn't a good way to deal with stress, I should be talking to people, and not isolating myself.
Basically, I'm fine with talking about stuff, but only after straightening it out in my own head first. I'd rather not jump into talking about stuff when I'm too upset.
My boyfriend said he didn't want me to go, but I said that I needed to, and that I'd just be going for one night.

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After I got back, he's been really weird about it. Like asking a lot of questions about what I was doing. And why, if I was just going to think, I had to be in the woods. Couldn't I think anywhere?
I tried to explain it like I did in this post, how I've done this for a long time, how it brought me peace. And he just didn't get it. He thinks it's unhealthy, that I'm running away from problems, etc.
How do I explain to a city boy that the outdoors really does bring me peace?
TLDR - I go camping when I'm stressed or emotional, and my boyfriend doesn't get it. He thinks it's unhealthy.


Source.