Have you ever lied about being a cheater due to pressure?

So I need advice, I asked my husband during a really emotional conversation to be honest about any past situations he kept from me to help us move on and to help him clear his guilt.

He said he would be honest with me but that it's really scary for him due to having done things he is not proud of and feels were deal breakers.

He started off by telling me he cheated on me, looked at me with hurt angry eyes and waited for me to say something and I told him okay, what happened in a really calm voice.

This was all before being married so I was clear with him that we both messed up being young and inexperienced in relationships he knew everything about me but I didn't know much about what went on with him. I was also away a lot so it was a half long distance relationship in our teens.

He then told me that he lied it's not true he didn't cheat that he was testing me.

This really made me confused as to why he would even say that in general I was really clear about being open to hear him without judgment.

Then he went on to tell me the things he didn't tell me which to me where pretty basic stuff and honestly wished he would have just told me back then. It was not a deal breaker just something we could have worked on.

So I need feedback on if anyone has ever lied about being a cheater or said something shitty just to see a reaction. Is this plausible or did you actually chest and just were to scared to talk about it?

(Side note he said he was willing to take a Polygraph to prove he was lying about cheating. Honestly I am unsure how accurate they are and I just want him to be real with me so we can at least get some marriage counseling to help us see what went wrong and how we can move on.)
Have you ever lied about being a cheater due to pressure?
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