Can I save my marriage?

[Lll54]

Okay, question... My husband has come over twice in a bad mood, including this morning. Stated both times he was in a bad mood. Then after being here for a bit he became more happy, getting out of his bad mood. And again stated both times that he isn't in a bad mood anymore. He realizes he is in a bad mood and then not in a bad mood, but he doesn't realize WHY...errr... Do I just ignore this the next time it happens? I feel like saying " maybe its cause you are home, and with me?" Obviously that's pursuing and i would never say that, but I just want to know if there is a good way to go about handling this next time it happens? Thanks for any advice.