Is it okay to tell your boyfriend that you think of your ex or miss him sometime?

Anonymous
My boyfriend and I are in a LDR. He knows about my ex, who also happens to live in a different place, he knows that we are not in contact. I never mention about my ex. But there are days, when I miss my ex or just think of him and get sad. And I fail to tell my current boyfriend why I'm feeling sad. So is it okay, to just be honest with him and tell him I was thinking about my ex?
Is it okay to tell your boyfriend that you think of your ex or miss him sometime?
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