Quoting s00nt0b04:" Sounds like a plan but what if I start getting emotional (everything makes me cry right now) or he pauses before an answer?"
Everything makes me cry anyway, haha. I bite my lip or inside of my cheek, pinch my hand, look away, pull my hair, anything he can't see that will distract you from crying. But crying is one thing, screaming and accusing is another. Ask yourself: do you want an honest answer now, or do you want to hold out a few more years of him going behind your back like this and find out then? Will you leave him if he is cheating? What if he's not, but wants to/plans to? Work all that out for yourself before you have the conversation, that way you're confident in what your next move is no matter how the conversation goes. Usually your instincts are right, and his behavior is definitely sketchy, but give him a chance to explain himself, that way you're not left with doubts or questions. Give him an opportunity to be straight with you, that way if he says "no it's nothing, you're just being crazy." and you still find evidence of these kinds of conversations with other women, you know he's definitely covering up something scandalous. People don't lie to cover up innocent things.