break up how-tos, a little advice from the experts? Options

[CallMeClumsy]

So. My boyfriend called my house and my mom answered the phone. He thought she was me. Unfortunately,my mom got all suspscious and asked me who he was. I simply shrugged it off and she told my father. My father denied it and said he trusted me. Note: my parents don't know about our relationship. It's killing me that my parents have so much trust in me and I'm hiding behind their backs. I want to break up with him ASAP, but championships are next week. The coach told me not to break it off until AFTER championships. But then, I don't want it to kill him over Christmas. Now, I just can't wait that long! So please...do you have some advice on what I should do?