So one of my oldest and best friends is getting married, and I was asked to be a groomsman. I'm in my late 20s but have never been in a wedding before. I pictured planning a bachelor party and that was about it. 

Today we went to a suit fitting which I thought I might have to pay for some of, but the suit rental is $200, and neither I nor the other groomsmen expected this. Doing some research I realize this is common practice, but I had no idea, and he made no attempt to communicate this cost. 

So on top of this, lodging for the wedding, and a bachelor party we are all looking at at least $500 each. I love my friend and I am honored to be a part of this moment in his life, but I feel that he didn't even try and prepare is for this expense and I'm feeling a little bitter. AITA?