Do you think he is ashamed?

My husband and I still live together for financial reason. We are in the process of divorce.
We took a lodger to help financially and I soon saw there was incredible chemistry between us. He started flirting with me and a few months later I could not say no and we had sex one afternoon when we were home alone. At the dinner table later that night he looked very quiet however the following day he was back to his happy and flirty self.
we are both in our early twenties ( I got married impulsively and naively. Big mistake) . When we had sex that night he told me I was his first but it was amazing and he was clearly happy. Why would he then look so shy and quiet afterwards? is he ashamed? Does he feel guilty because my soon to be ex husband is till living under the same roof? But if this is the case why then he keeps coming for more?

Do you think he is ashamed?
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