You need to learn how to be effective in a relationship without all the manipulation. You shouldn't have to manipulate people to get what you want in life. Strong people are honest and direct. They don't have to slip potions into drinks to win people over.
If this guy is on-guard after finding you out, then make no attempts for what you think might be the length of his time to get over it or forget or otherwise relax his guard a little and get comfortable again. Then, turn playful. Nothing overt, of course. Test his humor tolerances and joke around a little (harmlessly) with the intent to gauge boundaries. You will have to ease in, so have patience. Metaphorically, you are trickling water into cracks that show up in resolve, then freeze gradually and widen the cracks without him paying too much attention to temperature. If you know this person well already, you can work with that familiarity. People are often very forgiving, depending on various factors and the severity of the manipulation they find out about.
This advice can work in just about any situation with anybody. It doesn't even have to be about manipulation or ulterior motives. All you are doing is being a little more cognizant and deliberate in your interactions. Many people coast on an anecdotal level, not expecting or exhibiting much depth, except over time. The time will be lengthened with anyone that's found out before, but patience always works. Always.
"patience always works" I agree with BT.
I don't know what you know Dark, so I can't make any real judgement. But I can give you an instance where I was found out and how I dealt with it.
When I was in high school I ran an elaborate drug ring, and framed one of my dealer friends for some of my crimes. He ended up going to prison. After getting out of prison, he gave me a call. He said, "either you're a pathological liar or a complete sociopath because I have no idea how you pulled that off." Recognizing that I had a completely fake identity at the time. And I said the reason I assumed a new persona was because I was going through a tough time in life, and I had to distance myself from everything that I couldn't handle. He began to have sympathy for me, as I explained that it was difficult enduring the abuse I endured. And then I wrapped up the conversation ending on a positive note, that I had recovered and truly valued honesty now, and was in a better place mentally. Then we started talking about what I was pursuing, and what he was pursuing. I helped him get a job. Which made him see my as a friend again. I mainly just didn't want him blabbing to everyone that I was a complete sociopath.
I wasn't cautious enough at this time, and that's why it came back to bite me. I've learned to be much more careful.
Whether true or not, blanc's contrite admission to the guy she framed was a good tactic. Many believe sincerity is de facto honesty. You can fuck people over a million times and feel bad every time, but you still fucked them over. Who's the one not learning from the situation, you may ask...
Well, if he expects you to manipulate him, he likely already has his guard up to be naturally contrary. In that sort of situation, if he's stubborn enough, reverse psychology tends to work in a more direct sense. Once he hits a point of being kept guessing, vary between the two based on his tells. If you can make yourself appear intuitive, explanations that make it sound like you already know what's going to happen can still work through the illusion of inevitability. Beyond that, it's not really a one size fits all, but there will always be a weakness hiding in there that can be exploited.
In many ways, expecting you to be manipulative can make you more manipulative. If you are seen as manipulative, they both will feel a reason to guard against you more and will be that much more prone to falling into your traps. It also can grant more room to excuse your behavior, or if early enough with the right delivery it can look more like a scholarly quirk. Expectation itself can be a weapon just as much as blind sighting.
First learn to lie properly, make things seem more realistic (hint: give a little from things and dont try so hard "My mother died but it's ok I'm getting used to being alone"), and make your lies sparse in order to build up trust in people. Second, people can spot manipulation much more easier these days thanks to narc recovery and psychopath victim forums, so you gotta be more subtle. Instead of saying that hurt me so much you say "Oh...it's ok, I can deal with it fake smile and looking down" you get me