Am I really that sly? He cheats on her during the

I did something this time that I didn't think was possible before. I was seeing my best girlfriend's boyfriend and she phoned me during that time to tell me about her suspicions that he was cheating on her. I really hope that she didn't realise what I was really doing on the phone. And of course I hope that I was able to convince her not to worry too much. Because if the truth came out, I'd be really screwed. But it was also really cool and appealing to just carry on and not stop while she was on the phone. I thought it was really hot and I think I enjoyed it more than I should have. I really hope that I can keep the secret.