We (34F, 35M) opened our relationship and now I think my husband prefers “our” girlfriend

I’m (34F) and my husband (35M) we have been together for 14 years, we have a 7 and 3 year old together.

3 years ago husband got…well I don’t want to say bored, but I’m not sure what else to call it? So after a while (mostly begging on his part) I accepted to introduce a third into our marriage, we can call her “Harper” (25F)

Husband knew Harper before everything, she’s his sisters friend (another awkward story) and it’s been three years, I love Harper! She’s like crazy sweet, the children love her…we do girl trips, split everything 50/50, go shopping…

But husband most definitely prefers Harper, he pushes her to do exercise…to diet, to dress pretty, but she’s also the first one he’ll text if he gets good/bad news, she’s the first one he’ll greet when he gets home…they go on dates once a week…husband said it’s because Harper insisted and I didn’t.

I confronted husband and he said he just feels there’s more “intimacy” and like she’s his “best friend” I pointed out I’m the mother of his children, he used to say I was his best friend…he said he loves both of us, but feels this warmth when he thinks of Harper.

Harper doesn’t leave me out of anything, she’s always going out of her way to include me, to spoil the children and make sure everything is equal…

I don’t know what to do, because I love Harper…I just, want my husband to need me like he used to? I want to be my husband’s favourite.

All advice welcome.