My Brother Asked Me to Postpone My Wedding So He Could Propose to His Girlfriend at It 

Ethan, Lilly, their combined families, and their friends decided to cut Aaron out of their lives. Aaron found himself out of luck when he decided to treat both Ethan and Lilly with disrespect.

I can't believe that aaron can't see the enormity of what he's asking it's going to far

To Aaron: If you can't stop being jealous about your brother and your sister-in-law, then you do NOT deserve to be part of anything your now former family and your now former best friends.

Proposing at someone else's wedding is a big no-no unless you have permission from the bride and groom to do so.

That’s so sad. Selfish. I would have done the same. First try to deal with it privately but if he made it public, then all bets are off on my end to. I had a situation with my family too. I didn’t name names or post anything on social media. I called & tried to handle it in person but they refused. So as soon as I saw that i was blasted , names of my kids on social media, I flipped! Then, I did what I had to. In the end, I no longer communicate with them now.

I guess he wouldn't have learned anything if OP resented his brother's wedding invite

My brother broke up with his girlfriend at my wedding. Ya good times

The story ends kinda short and unfinished!

Aaron is supposed to be a man, but he's acting like a child. Why he doesn't understand that you don't propose to your girlfriend at someone else's wedding is beyond me, especially when its your brothers wedding. Aaron needs to not even consider getting married until he grows up.