How can you tell when a guy is cheating?

So the other day my friend and her boyfriend and I was hanging out...My friend had her boyfriends phone and this girl texted him and was like hey...I had a blast! Can't wait to do it again! She just pretended she didn't see it, because it was suppose to be a special and fun night. So after the night was over she called me and told me what was going on...She asked me if he could be cheating on her...I said idk? Ask him. She is to afraid to ask because she loves him a lot and doesn't want to get hurt. So the question is do you think he could be cheating? What are the signs that a guy is cheating?
How can you tell when a guy is cheating?
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