My husband and I were in divorce for 6 months and he also got jealous of me a few times as well. The way I handled it is I'd tell my husband that until I was legally divorced I would not be getting seriously involved with anyone (emotionally or physically), but since we were separated (and we actually were in the middle of a divorce) I would be going out with my girlfriends, groups of people and meeting both women and men. I'd tell him that I had no interest in a rebound relationship, and that I was working on being heathy and "healed" before I began any new relationships.
I think the jealousy shows how torn and confused they are. It's like they want to explore outside the marriage, but aren't entirely sure they want to leave (even my husband was torn about this while at the same time filing for divorce!!!).
I think it's important you keep GALing and having fun with your friends (and looking HOT when he sees you going out!!!!), but at the same time reassure him that your marriage is your number one choice and if and when he's ready to commit you'll be there for him. It's a bit like walking a tightrope. You need to be this happy friend that is there for them and cares enough to give them the space to figure out where they want to be, and yet also work on you and developing your own life, friends and happiness so that you'll be fine regardless of what they decide to do.
There is no arriving, ever. It is all a continual becoming.