My boyfriend said he hasn’t been in a relationship with any girl before he met me?

my boyfriend is very good looking and heaps of girls flirt with him even in front of me. He said to me yesterday that he has never been in a relationship until I came along and he had never taken them other girls seriously? What does this mean for me when a guy says this?
My boyfriend said he hasn’t been in a relationship with any girl before he met me?
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