The point isn’t whether she’s flirting or not. She’s already in the wrong by communicating with a guy in that manner.
And yes a man is required to satisfy his wife by whatever means necessary. They don’t need to have a candle light dinner or rose pedals on their bed, but he has to make an effort in trying to keep his wife happy. There are different types of happiness. Some husbands are able to respect and take care of their wives which keep them happy. And there are other ways to also make her happy and it’s obvious what the OP is talking about here.