Is it bad that I flirted with other guys when I have a boyfriend?

When I was younger I had this problem where I couldn't reject people; I didn't want to hurt their feelings. I would let them flirt with me for a bit and then block them or tell them I had a boyfriend so they would stop. I was always very nice to them (never said anything flirty back, just friendly), but I now feel horrifically guilty. It went to the point where I would let guys give me their numbers but then text them that I wasn't interested so I wouldn't embarrass them. I have had a boyfriend while this is happening and I feel horrible. Is this justified or am I being irrational?
Is it bad that I flirted with other guys when I have a boyfriend?
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