You are definitely in the right place! There are a lot of people here who are willing to share their thoughts and experiences with you.
These are my two cents:
Your husband wouldn't be so jealous of you if he was having his own fulfilling experiences.
I would suggest that you spend some time and energy on finding a couple you two can be with where he feels chemistry with the woman. This will give him a chance to feel things from the perspective you are at right now.
It is a bit selfish for one partner to ask their spouse to continue seeing a couple and having sex with a person that they are not really into.
There are so many awesome couples available. When we joined SLS over 2 years ago, we had 14 first dates with 14 different couples in 3 months.
Our objective is to pursue this lifestyle so that it is fulfilling for both of us. We keep that in mind as we move through it.
It would be to your advantage to put your own needs and desires aside for a while and let him have some fulfilling experiences for a while. Once he is having his own experiences - hopefully the two of you will continue to get closer and your sexual relationship will continue to improve
The key to life is in being fully engaged and peacefully detached simultaneously and authentically in each moment.