Here's the updated post which was deleted:

Here's a link to the original post: https://www.reddit.com/r/relationship_advice/comments/u3q7db/how_can_i27f_get_my_boyfriend31m_of_two_years_to/

Alright, so I’ve spoken with my boyfriend, and after a good long chat, I can successfully say: Mission Accomplished!

I sat him down when he came home Thursday night and seriously voiced my concerns, both about his safety and about our relationship. He hadn’t realized how big of an effect this had been having on me in regards to our relationship, and he immediately said that he was going to cut the time he spent out there in half. He said that we could spend the entire weekend together, and we pretty much did. Friday night was spent at home, and we went out for a nice dinner Saturday night after spending the day together. We were going to have a nice, lazy Sunday together, but I could tell that he was getting kind of antsy and almost nervous after church today, so I told him that he could go ahead and go to his tunnel early if he wanted to. I won’t lie, I was kind of hoping that he would stay at home, but he decided to go back out, which is alright by me.

I also talked to him about my concerns regarding gasses that y’all made me realize I should be conscious of, and he said that he’d work to get some sort of ventilation system installed ASAP, and that he’d even dig with his dad’s old gas mask if it’d make me feel better.

The only thing that I didn’t bring up was us maybe going to therapy about it, mainly because he said that he’d cut back and I didn’t want to push the issue too far. I think that he could maybe benefit from it, but he’s of the opinion that you only go to therapy if there’s something wrong with you, and I don’t want him to think that I’m saying that there’s something wrong with him. So, all in all, maybe I should have brought that up, but I’m definitely happy with how things turned out, so thanks everybody that gave some advice.

Also, a lot of people were asking why he tunnels, and while I’d asked him before, I asked again, and this was his answer: “It’s just pleasant. When I’m down there, I feel safe and calm, and I’m always happier when I leave than when I went in.”

TLDR: We had a good chat, and he's going to cut back on his tunneling

And this has gotta be some kind of weird writing exercise. OP's absolute refusal to elaborate on exactly how this dude is digging a tunnel is just weird behavior. Unless the dude is Minecraft Steve.