I've sponsored a couple guys who went back out. Experience has taught me that I can't help if the help isn't wanted, so I let them alone and just call every couple weeks. That's how I deal with it.
My suggestion to you is call your old sponsor, go back to your home group and get honest and check your motives for feeling let down. What did you expect people to do. I don't hang around people who drink. Not that the booze bothers me. I just don't like being around drunks who're acting stupid. I don't need the drama. I was told early on that I'm not God and I don't have the right to stand in the way of someone hitting their bottom. By the way, IMO, you didn't have a slip. You decided to drink again. Something caused you to make the decision that drinking was the answer. When you find out what caused that thought, you'll make progress toward not taking that next drink.