How to know when and when not to give space?

Question

I think my boyfriend has depression but sometimes I don't know whether he needs space or needs me to be there.
Last night for example he was acting all grumpy, complaining about everything, huffing and not wanting to watch or do anything I suggested. So I decided to just go to bed early. But when I did he got all annoyed at me asking why I was going to bed when it was so early. Basically acting like he didn't want me to leave. But when I was there he wouldn't talk to me or make a choice on what to do. 
Worried it will be the same again tonight when I get home from work. I don't want him to be all down because it breaks my heart and its a pain in the arse because he refuses anything I suggest making for dinner or doing.

Answer

It can be really hard to know how to help someone with depression.  My bf has it, and sometimes he really wants to be alone, and sometimes he'll want me in the same room but not necessarily talking or touching.  Just being there.  He doesn't usually tell me what he wants, it just comes down to me knowing him and recognizing verbal and nonverbal cues.  
For me, I do the same thing.  It's hard to communicate that I don't want to be alone, so even if I say I want to be, I often don't.  Still, if I say it, my bf will give me time.  If I'm crying, he usually knows that I need him there.
You really have to know your partner to be able to help him.  If you don't know what he needs, ask him, and be very perceptive to nonverbal cues.  Even if you just do what you think he needs, he'll notice.  He'll appreciate you caring about him and trying.  It really means a lot to someone with depression that you try.  Even if he's not being very communicative with you, just always let him know that you're there if he needs you and that he's not alone.  It means a lot.

Answer

At least in my relationship, we’re allowed to have bad moods and be grumps... but we’re not allowed to take it out on the other person.  That’s a huge no no. So I’d say this is more of a communication issue. 
Since I’m generally not concerned about censoring my words, this is a pretty typical conversation for my husband and I.
Husband grumping around and being a snappy jerk. 
Me.. “I understand if you had a bad day. We can talk about that if you want. However, you need to stop taking it out on me. Knock it the fuck off.”
Husband.. “oh, I’m sorry. I didn’t realize I was...” and then he’ll start talking.

How to know when and when not to give space?

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