Oh boy, sweetie, first you need to calm yourself. Second, stay off of facebook. I'm famous here for my facebook rants, I hate that site especially for people like us. It just gives these WAS's a new arena to hurt us. The cool thing is, though, that you can ignore it and stay off of there.
You know exactly the behaviors that you need to engage in. You've said it all: "Being friendly, acting happy, no r talks, changing behaviours he had complaints about." Are you doing these things??
If you read up on my H, you'll see that he did exactly the same things. Only OW pictures were up on his page. He also called a lot, asked permission to do things and was much more persistent when I was ignoring him. My H also unfriended OW. Good news? My H is home right now.
Do not worry about him drawing closer to OW. That isn't your concern right now. Fixing yourself is your concern right now. If you focus on the M or the OW, you will lose it faster than you can blink. What are you doing to get yourself back? What improvements do you think need to be made? What things in life are going to make you happy (exclusive of the marriage)? You need to come up with this list NOW and start working on it. Nothing will change in your situation until you take a leap of faith and TRULY change yourself. Find something that you can really get into. For instance, for me, I took on a whole new fitness program. I hired a personal trainer and I spend a lot of time at the gym. It's been awesome for me and I have been A LOT happier. Find something like that. One of the girls on here actually started taking flying lessons!!! How cool is that??? Once you do these things, in all likelihood, you will make him curious. But most of all, you will feel happier and more confident. This isn't about him anymore. This is about YOU.
I'm so sorry for the pain you are in. Please know that there are a lot of us who are here to help and talk to you and maybe be able to receive some of your good advice.