the other couple keeps texting only him after our meet and Im starting to feel invisible

we met a couple about a month ago, our age (mid 30s), good chemistry, did a full swap that went really well. we all said wed see each other again and everyone left happy. since then the wife of the other couple has texted my husband three times. like... not group chat, not me. just him. once was a meme. once was "hope youre having a good week". once was a slightly flirty thing about a song. dh has shown me every text immediately which I appreciate, and his replies have been polite and brief and have included me ("we'd love to..." etc). hes not hiding anything. so on paper everything is correct. but. she has not texted me once. not once. and her husband and I had what I thought was a good connection too but he hasnt texted me either. so somehow the dynamic on their end is that she initiates and only with him. Im not sure if Im being silly here. its not cheating. its not against any rule we have. dh is being open and clean about it. but I feel like Im watching a slow leak in our 4-person bubble and the leak is pointed at me. how do you handle this. do I text her first to break the asymmetry. do I bring it up with dh more directly. do we just not see them again. weve already canceled a follow up meet bc of how I felt about it and I havent told them why.