I'm a 31-year-old guy, freelance, living in Korat. Been with my girlfriend almost 3 years. Right now I'm super confused and totally quiet.

Last night around 7-something I went to pick up my laptop I’d left at her dorm, and I accidentally saw a small receipt stuck by a little keyring on the table. It’s from a Thai dessert shop near the playground by our neighborhood — a queue slip for buying a garland and some snacks for two. There’s a name I don’t know written on it and a phone number, clear as day. The same number showed up in her call history about three weeks ago — a very short call, not even ten seconds, like 7–8 seconds. So now I’m really bugged. Seriously confused.

I’m not a clingy guy to the point of being annoying, but this is weird, really weird. Wait, maybe it’s just an old friend. Maybe a relative she bought something for. Maybe she helped buy something for someone she used to talk to. But my mind just runs wild. She might get pissed if I bring it up since I snooped into her stuff, and I don’t want to make a big deal out of it.

Should I gather more evidence first, or talk to her straight away? Like, politely, express concern, not yell or accuse — but how do I ask in a way that actually gets a real answer? I’m a freelancer so I don’t have a boss to ask for advice. I really want friends’ perspectives: if I talk, how should I start? Should I show the receipt right away or just say I saw something and it made me uncomfortable and ask?

Newbie at making threads here, please give advice T_T

P.S. If the caller was just someone who took the order, I’d be fine and want to end it peacefully. But if not, I need to know the truth first. Give it to me straight.