My friend ask me a favor regarding his children but I turned him down. His ex-wife is also a friend of mine and she had know about the request. She is known to be at times unreasonable and quick to anger. There was a possibility that my turning down the request would make her angry with me.
I sent him a text message: "Do you think your ex will get mad at me?" He replied "She is the way she is, might or she might not. Shouganai"
He is a native Japanese speaker. I'm just a beginner student of Japanese.
Wht do you think he meant by "Shouganai"?