Time is the best healer ever....He's such a mean person, not just to you, even to his own kid...his kid would miss you too....and I'm sure what he's doing to you, he will do that to the other woman too....Nobody would get benefit out of building up their love on the others' misery!
Stay strong....and you will be surprised with what will happen!
About the real estate guy....be careful....that's their job to stay close to you and show their friendship or even use their sexuality for their clients....then once you sell your home, you will never hear from them.....just be very careful...right now you are fragile and sad and you want to get into another relationship, but you can get into the bad ones.....try to heal yourself first...and your ex-bf is not worth it at all....I can't understand how he moved on this much quickly even! and the cheater will be a cheater always....