What are you doing to GAL? At this point, you need to focus on yourself. Right now is great time to start because you are still living together and it will be easier for him to notice/see changes.

I would stop all pursueing behavior.

I would not get him any gift for his birthday as that can be perceived as pursueing. Have you read the book Divorce Busting yet?

M-34, H-37, No Kids
Married 4yr, Together 6yr
Discovered EA 7/24/10
Separated 8/6/10
Filed 8/16/10
H Moved home and Piecing 9/20/10
H returns to OW 12/10
EA was really PA
I file 12/29/10
I move out 12/30/10