A university classmate whom was part of my social clique did not invite me for his wedding after knowing him for at least 10 years. Should I consider inviting him for my wedding in future?

You can, never let others actions change the way you will behave, always react according to your own morals and values.

IMHO, if you are inviting the others in your social clique, you should also invite him

I usually return the flavour accordingly. Lol I do take revenge on people.

​

But basic courtesy wise, if you are inviting a whole clique/dept colleagued/etc., you must invite everyone including those who wrong you. It is important to be the 'bigger person' in general social setting. So if you like to be dipomatic and a good person, you should invite everyone including the assholes.

Maybe not unless you have reconnect with him before your wedding.