Husbands friend is getting a bit too friendly??

My husband has a female friend who he met a couple years ago in school. She recently got divorced and is now a single mom. Ever since the divorce, she has kind of latched onto my husband in a strange way. All of a sudden she is popping up everywhere.


She is constantly reaching out to him via text and instagram. Like, every single day I see her name on the phone. Anytime I bring it up he insists she’s just lonely and needs someone to talk to, and he shows me the conversation. It’s always just innocent chit chat.
Or she’ll suddenly have a work related question and “book 30 mins on his calendar” for advice because they’re in the same field. He doesn’t try to hide the phone call or anything and it’s always just a work related convo. But something about it gives me a weird vibe that I don’t get from anyone else. It’s like I can literally smell her intentions from a mile away.
But the icing on the cake was today when she sent a Christmas gift to our house and addressed it only to my husband and our son!!! She knows damn well who I am. That put me over the edge and I finally snapped and told my husband this is getting inappropriate, and I demanded to know why he feels the need to remain connected to this person.
He insists she is just a lonely person who he feels bad for and he doesn’t want to be rude. Now I have dated cheaters in the past before I met my husband, and I don’t think he’s doing anything like that. However I do think he is ignorant to the fact that she is desperately hoping for that to happen, and I feel disrespected.
I don’t know how to ask him to end this little friendship without looking like a crazy insecure person.