How Do You Know If Someone Is Bi-polar? I Have

How do you know if someone is bi-polar? I have a husband that has terrible mood swings. Something as lttle as saying the wrong thing sets him off. He stops talking and won't eat with me, and it's always my fault. It keep getting worse as he gets older. Right now he is in the nasyt mood. Blaming me for the issue that happened the other day.