No apologies needed.

What do you want to do now?

It sounds like you are more than "just friends with benefits". You've grown into top/bottom play partners.

It's natural to "fall for your dom". Each time you have a good, positive physical contact with someone, that person imprints a bit of themselves onto you, making you want to get that good feeling again and again.

What are you seeking?
Do you want this to turn into something more?
Something exclusive?
Are you looking for a long term relationship with your partner?
Or do you just want to keep doing what your doing?

If you want the last one, then keep having fun.
If you want something more, then it's probably time to have a wee bit of a chat with him.

To your success!