Do men ever feel any Regret or Remorse, for hurting the woman they claim to love..??

You don't mention how old he is, just that he's younger but here's what I've learned in years past. Men don't think, period, so when his brother dropped by out of the blue, he wouldn't think to call, just that you'd understand when he explained later. Men just aren't considerate, and those that are on some occasions tend to have had a previous girlfriend that have instilled it in them. How should you handle this? Only you can answer that question, stay and have him do it again or leave and find someone else who will likely do the same thing in a different situation. Sit him down, stay calm and tell him how he made you feel, alternatively, do the same to him, make plans with him, then go out with your mates at the last minute and don't phone him to tell him, then when he kicks off about it, explain that he now knows how you felt. Play him, the way he plays you. He does something that annoys you, do it in return, he'll soon get the message.