This might have something to do with why Justin Bieber’s been crying lately:  “In Touch” magazine says that he and his wife Hailey are only spending a few nights a week together.

A source says Hailey wanted some space, so Justin got his own place in Beverly Hills . . . and he’s only spending a few nights a week at home.

Supposedly, they’ve been having issues over, quote, “his exes, starting a family, and his endless adolescent tantrums.”

The source says, quote, “He’s lost without her.  But he’s trying to be tough about it because this is something Hailey wants . . . [He’s] hoping this is just a phase and they can go back to the way things were by summer’s end.”