I feel like it could be that you are feeling more friendship with your husband now.

I think that instances where jealousy can indicate love or at least desire, is that it's less about "this person is having my person" but more "I want to be with my lover and they're not here, they're focusing on someone else and I feel lonely and frustrated because I can't be with the one I desire". It's indicative of really wanting to spend time with your partner, to the point you miss them when they're not around and long to be by their side. A certain amount of this feeling is healthy in a relationship. Which is why for some polyamory can bring back the spice into a relationship as it causes desire that feels sweet when it's fulfilled.

If you don't care if your partner isn't with you, you don't miss them when they're not around, but you do enjoy spending time with them when they are around, it seems a bit more platonic than romantic.

For me, when I was polyamorous, I didn't feel jealousy because I didn't like my partner's metamour - I supported their relationship. It was more that I felt lonely and frustrated and unfulfilled sometimes when he would spend time away from me, because I had all these sexual feelings and desire to be with him, and frequently when I would want to have sex he would already have had sex with the metamour and thus I would feel like he got all the sex he wanted and I got half the sex I wanted. But because I didn't want to be with another man, me dating someone else wouldn't have satisfied me either.