My boyfriend told me im replaceable?

After being together for two years he told me that all girls are same to him and that the only difference between me and other girls will be marriage and when we marry that will be the only differences , im kinda lost i don’t get what he means, i told him if he saying that to breakup with me he said no i don’t want breakup but if you breakup also there’s no problem i will forget in one day
My boyfriend told me im replaceable?
Post Opinion