Am I being unreasonable for feeling upset that the guy I like had dinner with another girl at her house?

Anonymous
Backstory:

I have been seeing this guy for about 5 months now and everything has been great. we established that we were not going to be intimate with anyone else but we are not in an official relationship because he is still healing from his past bad breakup. I respected this and I didn't want to push him into anything. Today I found out that he was having dinner with a female friend, 1-on-1 and at her house. and he didn't tell me about it. He has gone out even with his ex before and I didn't have an issue with it because he told me about it by himself. This time I'm so so sad that he didn't tell me and that makes me suspicious. He acts like nothing is wrong between us so I don't understand why he wants to have dinner with another girl?

I don't want to tell him he can't hang out with girls, because I know I don't have the right to. But I've been crying my eyes out for the past 2 hours thinking about him being alone with another girl and what they could possibly be doing. Im too scared to talk to him about it. not because he will get upset but because I don't want to seem crazy.

Am I being unreasonable for feeling this way? I am so in love with him that the thought of him with another girl breaks my heart
Am I being unreasonable for feeling upset that the guy I like had dinner with another girl at her house?
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