Any tips for not splitting and remembering I’m loved even when my gf takes space for a day?

Lack of object permanence and self doubt creep in. She is great and it’s nothing malicious. She has BPD traits also, and has to regulate her nervous system. I’m super chill with that and do the same thing. BUT

I need this little demon off my shoulder that says “She lost interest. She is bored of talking to you and seeing you. She will never write back. She is going to ghost you.”

The contrast between the bliss I feel around her and while chatting is so extreme versus the emptiness and crawling in my skin during necessary times of space. It’s so dumb because I need the space too!

Also I have too much ego/pride to ever seem desperate or clingy. If I feel someone pulling away, I usually beat them to the punch and vanish even faster. A self defense move I guess?

However that’s not what this is. Everything is fine. It’s great actually. Just my emotions and nervous system trying to act like absolute truth when it rarely is.

What do you all do in similar situations? Did it get easier with time and trust because you healed and learned they always come back? We are newish but it’s safe and communication is excellent. Feelings are mutual.

It really just feels like me and I want to get out of my own way lol. Help