Why?

Man ( newly married/ to be married soon ): Oh, now that I am married/going to get married, there goes my independence, and begins a new phase of slavery...

Others/Everyone: Ha ha ha, LOL. Another one bites the dust. Ha ha ( loud raucous laughter, with snide jokes)

Woman: I'm getting married. There goes my no-accountability life, got to start thinking responsibly.

Others/Everyone(with an indulgent/ supposed to be 'wise' smile): This is a new phase in your life, look at it positively. (another smile, and then mebbe holding hands or stroking hair) There is a particular time for everything, and this is the time for your marriage. Look at it positively. You are marrying someone you like. I am sure you will have fun with him too.

1. Why?
2. Why the justification: "I am sure you will have fun with him too."