Guys Is exchanging numbers with a guy while in a relationship part of cheating?

Me080Mo
I went to see the university that I might choose go to it next year and I met a guy there. He seemed very nice and he answered all my questions and he took me in a tour inside the campus. After we talked and laughed he asked if we can be friends and I said sure, so he gave me his number and I gave him mine because he seemed nice. Later that night I was talking to my boyfriend about my adventure when I mentioned that part he gave me a weird look without commenting on it. After few minutes he wanted to leave to get ready for work and he left without kissing me like every time. He hasn’t said anything about it until now and I can’t stop feeling guilty because of what happened.
wha should I do?
Guys Is exchanging numbers with a guy while in a relationship part of cheating?
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