Why does she treat me like a mate and not a partner?

We've been together 3 years, on and off. She’s always been a bit reserved, but now it’s like… we’re flatmates who catch up for beers. Talks to me like I’m her work mate or something, not someone she’s supposed to be building a life with. No real talks, no cuddles, nothing. When I tried bringing it up she just said ‘You’re overthinking, love’ and changed the topic. Feels like I’m the only one who gives a toss. I’m away 2 weeks at a time with the mines, so I get it’s not easy… but when I’m back, it’s like she’s just… not keen. Doesn’t ask how I am, doesn’t plan anything, just vegs out. I’ve started wondering if I’m just a convenience. Bit gutted really. Thought we were heading somewhere. Now I’m just second-guessing everything. Maybe I’m too soft? Or maybe I’ve missed some red flags along the way… 🤦 Just don’t know how to bring it up without sounding like a wanker.