Found my boss crying at work and I'm not sure what to do?

Anonymous
I work at the Fine Arts Center of my school, which rents out the space to dance and theater companies. My boss is the technical director of the building, but the current group there is also the theater group he works for. He's the stage manager for them and his girlfriend is the costume designer. They have been fighting at work all week and tonight they had a massive blowout. I was doing a walkthrough and I saw him in the hallway crying. I asked if he was okay and he said yes, but clearly he wasn't. I asked if I could go on my break because I figured he wouldn't want me there. He said yes, so I did. I've been back for twenty minutes now and things seemed to have calmed down. I haven't seen him since, but if I do, how should I react? I was tempted to ask him if I could give him a hug when I saw him crying, but I didn't want to undermine him. I don't know if I should ask if there's anything I can do for him or whether I should just leave him alone.
Found my boss crying at work and I'm not sure what to do?
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