I am right with you, but only you can make the decision as to what is best for you. You may be a little naive, but H is still drawing closer and closer to you. OW3 could him really not understanding boundaries (like my H having a R with OW, but still telling me he loves me too. I always wondered what OW would think if she knew what he was still doing and saying to me). H may not understand the rules of M still apply even though you are separated or in his mind they don't matter since you are separated. If he is always flirty by nature to get his way with women, it is just something he has to learn and I agree you need to stop saying it to him, but MC would be a great place.
Really soul search and do what you feel is best. Remember if you figure it is the "wrong" decision then you can switch and stick to it. The key is sticking to it so just stick with whatever you choose and if it feels wrong after a month (unless something huge happens) then switch.
Me29 S3 H left 4/1/09 I file 8/2/10 Divorce final 5/17/11 1st http://www.tinyurl.com/25lhu52 2nd http://www.tinyurl.com/2c35ueg 3rd http://www.tinyurl.com/322yk89