What is the mature way to handle my boyfriend standing me up?

Today the guy I’m seeing we class each other as together but he hasn’t asked me officially. He mentioned that we were going to go for food all day I’ve been waiting I called him to ask he said he call me back and never did. it’s been 8 hours. So I just called him it’s not 10:30pm at night and his phone is OFF he’s gone AWAL. Things like this really bug me and my immature side can come out, usually in times like this is text saying something immature or stupid saying ‘thanks for letting me know’ or just jumping to conclusions that he’s with a woman. What is the nature way to handle this. Do I say goodnight, do I even say anything at all? Do I just not say anything? I’ve called and his phones off so do I just leave it at that?

What is the mature way to handle my boyfriend standing me up?
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