To me this is three separate things.
Constant contact like what? Text? Email? Calls? Cuz that's not
in person time. Not even calendar time from the sound of it. And is being in constant contact balanced living or just adding to your ugh because it just reminds you of how you aren't together in person?
If it were me? I'd be willing drop some of the "in constant contact time" because that's too much time on that. (Email, text, phone, whatever.)
And better balance it out with with some "in person time" and some "alone on my own time."
Do you WANT to know that stuff? How much or how little stuff is enough? Have you had the conversation with your GF about info management?
Some things you need to know. Like things that pertain to sex health hygiene.
Other stuff is optional / you might not care to know. Does your GF pause to ask if you want to know? Obtains your consent? Or just starts gushing poly random at you? Just cuz you are a partner doesn't mean you have to be up for everything ALL the time.
If it was me? I would not mind hearing small stuff like "Oh, I went to a restaurant with New Guy, and had the yummy decadence cake. I think we could go try that together sometime because I know you love chocolate. Is that something you want to do or do you want to do something else for dinner?" That's fine. Brief mention, our time together is mainly about me+ her.
If it's going on and on about New Guy? Like "Oh, I went to a restaurant with New Guy, and had the yummy cake. New Guy thinks they have the best cake ever! New Guy said that their open mic music was awesome. New Guy thinks that we should try it again on Trivia Night."
I'm not the one dating New Guy. Why would I care? My time with GF is supposed to be about (me + GF), not my time with GF is about (her telling me stories about this other dude.) I would find GF doing that kind of info gushing behavior at me pretty annoying.
You could talk to her about seeing her more regularly on the calendar then. So you can stop feeling sad that you aren't seeing her much.
Or maybe it is a mix? Sad you aren't seeing her as often? Plus coming off the NRE lalas with her? NRE lasts about 6 - 24 mos. So at 9 mos in or so... your NRE lalas might be fading. Those pink cloud lalas can give you something like a "high" from all the brain chemistry going on. So when that phase is done you might experience something like withdrawal.
https://sitn.hms.harvard.edu/flash/2017/love-actually-science-behind-lust-attraction-companionship/
Galagirl