So, friends, what do you think — should I trust my gut or am I overthinking this?

It started last week. I'm 29, an accountant in Korat. We've been together almost a year and everything felt fine, but lately a bunch of weird little things have piled up and now I'm getting worried. Totally confused lol.

For example, she's been getting home late from work more often, saying she had OT and getting home around 9:30pm a lot. Her replies on LINE are slow too — she'll read it and then reply the next day. Sometimes she leaves her phone face down on the dining table and it's completely silent. Yesterday a female friend told me she saw my girlfriend at the little noodle shop at the mouth of our soi with some guy — tall, skinny, wearing a dress shirt — and they were laughing and talking like they were close. I was like, huh? Strange.

Another thing: there's a smell of cologne I haven't seen her wear before on the collar of her shirt and on a small necklace she was wearing when she came over, and some stories on her social media keep disappearing. I'm not digging through her history or anything, but I notice stuff — or maybe I'm just jealous lolol. Really confused.

When we're together she's still sweet, holding my hand to go to the night market, buying fried snacks and eating like before. In some ways she's a good girlfriend, but when I add the signs up it weighs on me. I don't want to make a big deal out of it. If I ask her directly she could deny it, or she could admit it, I don't even know.

I want to confront her but I'm scared it'll turn into a fight. And if I'm wrong it'd damage trust for a long time. I spent like two hours stressing this morning, running the same loop: should I check her phone? Ask her straight up? Or wait to collect more proof? She hates people snooping, but I want to know T_T

Anyone experienced this before? What should I do — confront now or wait to gather more evidence? This is my first time posting, sorry if I messed anything up. What do you think I should do?