Fiancé got confronted that he texted a Insta model but says he doesn’t remember that he did should I believe him? And what should I do?

Hey guys I’m 22 years old and I’m very Conflicted right now. my fiancé 22 has texted one of the most beautiful girls on insta and she told me about it in insta text sending me a pic of the conversation. he only said Hey what’s up. Making me feel angry and sad. I told him about it and says he doesn’t remember about it. We’ve been together for 3 years and he never done it before but only he likes and follows. I’ve already told him how I feel about the whole like and follow before he even told he he’ll never do it again. But now After a week just me telling him that a insta model telling me about him texting her. I don’t know what to do now. I don’t know to give him a chance or have a break before our wedding or not having a wedding at all? I’m very devastated. I just found out about it just today if possible please anybody can help me.
Fiancé got confronted that he texted a Insta model but says he doesn’t remember that he did should I believe him? And what should I do?
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