Dear {Recipient} I sincerely regret my actions on {MM/DD/YYYY}. They were inappropriate and resulted from a momentary lapse of judgment on my part. Please accept my apologies for {state the problem} and for creating an awkward and embarrassing situation. You can expect better from me in the future for I will practice better restraint and exhibit behavior that befits the environment and situation. Please feel free to contact me at {email/phone} if you would like to continue this conversation. I look forward to hearing from you and putting this matter behind us. Sincerely, {Sender}