<human>: Give me a shortened version of the text

I went through my boyfriends phone today.. We've been arguing for days over multiple things. I have a best friend that he texts, usually when we're arguing. It was a short conversation, but the gist is basically him telling her that he's sick of life, and he's not happy at all...

I feel like I've failed him. I've been in love with him for so long, and we've made so many future plans... We always thought we were gonna be THAT couple that met in high school, and stayed together forever. Then sometimes I wonder if I'm not being realistic enough. I don't know how to handle this issue.

He asks me if I still want to be with him, but I'm not the unhappy one... He's unhappy, and I have confirmation of that in TEXT MESSAGES to my BEST FRIEND. I had a feeling a long time ago that he might be getting tired of me. He nitpicks a lot.. and yells a lot.. and we argue about stupid stuff. His fuse is almost nonexistent. Things weren't like this in the beginning. I feel like now he's just giving me what I want, and torturing himself by staying with me.
Some people say in this situation, that if I really want him to be happy, I'll let him go.. some also say that I have to keep trying and fighting.. They both sound logical.. but I don't know what to do.
<bot>: My boyfriend is unhappy, and he was very clear about it. I don't know how to continue this relationship knowing I've obviously failed him.