He admitted he sometimes thinks about his ex when he masturbates?

My boyfriend and I are long distance and our conversations often turn sexual. Last night, after our ‘sexy’ time, I casually asked him if his ex popped in his mind when he masturbated, to which he replied with sometimes after a few seconds of silence. Now I regret even asking. I don’t know how normal is this or if I should be worried. I mean, my ex is an ex for a reason and there’s not even room for him in my mind now. How do you think I should react? I keep thinking about this and feel some trust issues coming their way
He admitted he sometimes thinks about his ex when he masturbates?
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