I LIKE your attitude!!!
And I like that you are learning to enjoy your life more and beginning to DB more for you than him!!!

Sure, we do want our marriages to stay together, but we need to DB for us too.

Just so he doesn't think you are doing this for him specifically, you can say that you are finding that going out with friends is a lot more fun than you realized, and gosh, you just didn't realize how attractive and fun you are!!!! If you continue to be busy, and not always available for him... he will realize it's not for him. (Like arrange for a fun night out during his birthday party!) And then every once in awhile (start off very slow with this) you throw out a bite (like fishing! Hee hee!!!!), invite him to do something... then be VERY busy again. He will realize he's not the center of your universe, but a friend on the outskirts... and that will be good. Safe for him... but it might be a little interesting for him too.... mystery...

There is no arriving, ever. It is all a continual becoming.