Anxious about FP

I need an outside perspective. My fp messages her husband right away, but doesn’t always respond to my messages right away. She said it’s because she’s mentally drained from working but she still looks at her phone to respond to him, and ignore me. Can someone explain to me why this is? I know she doesn’t owe me a response but I’m going my BPD therapy paperwork and I can’t seem to wrap my head around it. Is it because it’s less mentally draining to talk to her husband? Is he more important? I just need someone else’s perspective to wrap my brain around this so I can get through it.