After an awkward comment
I am sorry for what I said earlier. I can see how it may have made you uncomfortable, and that was not respectful. I should have thought before speaking.
After too many messages
I am sorry I kept messaging when I should have given you space. I understand that it may have felt intrusive. I will respect your pace and boundaries.
After a misunderstanding
I am sorry for the way I reacted before I understood the situation. I made an assumption and handled it badly. You did not deserve that reaction from me.
After embarrassing them
I am sorry for putting you in an awkward position in front of other people. I should not have made that comment publicly, and I understand why it was uncomfortable.
After jealousy
I am sorry I reacted as though I had a right to question you. That was unfair. My feelings are mine to manage, and I should have treated you with more respect.
Simple apology
I am sorry for my part in what happened. I am not asking you to reply or make anything less awkward immediately. I just wanted to take responsibility and give you space.