First of all, please note that you wrote "marriage life" in your post but you have actually mixed together two phrasings, as you can see below: - marriage life + married life + marriage As for the meaning of insult, the vocabulary itself can be used as both a verb and noun. Both in general and in this sentence, it means to say something that 'hurts' someone's feelings or pride.

Insult is a rude expression intended to offend or hurt. The man was offended (insulted) by the opinion of his life.

I think the speaker (Person A) means, that he feels disrespected by his friend (Person B), because Person B is comparing his life to Person A. Just because A doesn't have a "so called" perfect life, doesn't mean that he's a bad person or unhappy. I hope that helps!

I accidentally wrote my answer as a reply, so have edited this message. Please see my answer below.