You are doing good. 3 days is great. He asked you why you hadn't called. You responded well!! Think about what that means. Because you are not being needy and clingy and you are giving him space (like he asked for) he has no idea what you've been doing, so he's thinking about you and wondering. If he's soooo in love with OW, why on earth would he want to hang out with you? hmmm? doesn't make sense does it. Just keep doing what you are doing. Hang in there and when you can't actually be strong, just fake it.
He reminds me of a cat with a ball of string. When the ball of string is just laying there, he doesn't care. maybe bats at it a bit, but that's it. Once you take the ball and start to drag the string away, then he's like "wow, i didn't know it did that. I better go get it" ... you gotta just keep pulling away.
If he wants to hang out with you so bad and wants to keep tabs on you, he needs to get over OW.
YOU CAN DO IT!!
If i can't fall in love... I'd like to fall in chocolate! ~ Author Unknown