Guy I'm 'seeing' kissed another girl - How should I react?

ruby123
Long story short, a month ago, I had a one night stand with a guy I met on a 2 week college trip, we told each other we liked each other, and have been texting back and forth every day since. We've gone on three dates together and are going on another date next week (we've slept together after every date and hung out in the morning also if that means anything?)

He had a college grad party yesterday and I've seen a pic tagged of him on Facebook making out with another girl. He told me that he wasn't that drunk at the party also

I know we're not together so there is no commitment or anything, but I have to admit I do feel a little upset, but should I be angry at him or how should I react?

Guy I'm 'seeing' kissed another girl - How should I react?
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