Most Helpful Guy
Alright, the easiest thing to do is confront him, but do so in a way that makes him feel "guilty" without actually making an accusation. It may seem a little shady on your part to do so but getting the truth out of him is your primary goal. Doing this requires that you ask him if he's been out with a look of concern and maintaining that look, staring into his eyes, for a moment in time. Inability to look you back into the eye should be noted as well as any nervous behaviors he may have when asked questions that clearly indicate he is lying. Doing this in a fashion where you are not busy but also not cuddling / totally relaxed would be best, and doing it by "surprise" would be even better. If he asks "Where did that come from?", as he likely will, do not respond and just tell him to answer the question.
Despite your knowledge you should be able to, before revealing yourself, get the truth or at least some basis for the truth from him. I am not saying that you not trusting him is bad or anything like that, but you want peace of mind, and that I believe will give you such. Mind you if he is a skilled liar he will get away, but having known him a year and having had him confess this to you there should be signs that you will know of to read. If not, simply look up common signs of nervousness and lying.
Now body language is an "okay' lie detector, it isn't fool proof, a lot of people freak out and get nervous when on the spot so don't immediately take all nervous signs as proof of concept, but rather if the signs persist while he looks to express himself. Whatever you do make sure you do not lie about anything; don't tell him you "know", because that would cause you a huge number of problems and also put you in the same boat. You want to make sure you can trust him not dissolve communications and trust further.
Asking him in public at a restaurant or in a park populated by others will definitely exemplify the lying effects. If nothing else normal people hate being exposed in the sunlight, both metaphorically, and literally, when it comes to this issue.
That's all I got. Hopefully someone comes up with something better than this.
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