Is there any way to tell if he is cheating?

my boyfriend has a baby and his ex is a wacko.

she takes these surveys on a website and one of the questions was was last kiss within 6 hours ago. and she said yes. and my boyfriend was over there within those 6 hours. I'm not sure if she says stuff because she wants me to break up with him or if he's cheating.

Is there any way to tell if he is cheating. I've already tried talking to him and he doesn't want me to say anything to her because he doesn't want more problems
Is there any way to tell if he is cheating?
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