Hi,
Welcome back. Stay committed!
Get this "friend" to slap that beer right out of your hand if he catches you with it! Why didn't he question you like, "Hey, you aren't having that!" or "Hey, pour that out!" or better yet, "Hey Christine, lets not hang out while I drink beer, lets go out and do something fun and grab a latte while we are out. "
We put ourselves in social situations that test our resolve. The focus now is to learn from this so you don't suffer a repeat next time you are at a home that has a fridge full of beer.
Re-committing to your program now is better than giving up. I'm glad you are back.