Last night I couldn’t sleep at all.
It’s a short story but it’s been bugging me a lot.
I’m 42, office job in Chiang Mai, been with my girlfriend almost two years. Met through a friend of a friend. Things have been good mostly. We don’t really interfere in each other’s personal life much, but I keep a little guard up, you know?

Yesterday I got home before her. She said she was going for a run with friends at the park near the walking street, around after ten. She told me 22:15 actually, but I got home about half an hour earlier and saw she was still online on LINE, so I didn’t pry. Then around 1 AM I popped into LINE for like, not even three minutes, totally by accident, and saw a timeline notification — a photo of her with another woman. Not someone I’d seen before. They were sitting drinking together, wearing plain t‑shirts, and there was a little bear keychain hanging from that woman’s bag that stood out. My first reaction was like, wait what. The caption read kind of flirty-ish too. Super confusing.

I then stalked that woman’s social a bit and found out she’s from a dance class near my girlfriend’s studio — something my girlfriend never told me about. Huh? Confusing, right?

I laughed on the outside but inside I was angry, confused, mixed feelings. I want to ask straight up but I’m afraid it’ll make me look like I’m accusing her. Hard to explain. Sometimes I feel like grabbing my phone and firing off “Where did you go last night?” but I’m scared my voice will come out all mad. Ughhh why am I feeling like this, seriously.

What should I do? Should I be blunt now or stay quiet and watch her behavior for a while? Or am I snooping into her private life too much... I really don’t know. Everyone says trust is important but sometimes it really shakes, you know T_T

Friends, what do you think? P.S. If I decide to ask directly, how should I start so I don’t blow up the mood?