How would you feel if your S/O was partying with two females while you weren't around?

Lana

Long story short: I was spending time at my mother's house. The next morning my S/O comes to pick me up so we could head back out of state and I find out he was partying with two females the previous night. Multiple belongings of mine came up missing out of our car which includes my entire makeup bag, wallet, and sunglasses. I find it wrong because I was trying to get in touch with him the entire day with no luck because 'he lost his phone' What would you do if you were in this situation?

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