How bad is it to seek attention from other men while being in a serious relationship with a guy?

I am a 29-year-old working woman in a long distance relationship with my boyfriend. He is a true gentleman and I know he loves me. We even plan to get married next year. But my problem is I can't stop seeking attention from other available men. To an extent that I keep my relationship status hidden. Whether it's a casual talk or a bit of flirt I enjoy every bit of it and long for more. Sometimes I feel I just wanna make them feel attracted to me and kinda approach me but that is it. I have been in abusive relationships in the past for more than 10 years and I know how it feels like to be disrespected in a relationship and I somehow feel that I am treating my boyfriend the same way I used to be treated in the past. I love him and don't wanna leave him.
How bad is it to seek attention from other men while being in a serious relationship with a guy?
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