my bf is a man whore

So my boyfriend is 10 years older than me and has slept with a lot of women. He's known in our small town as being the "good looking one" and girls have always chased after him. Well he's finally settling down in his old age but I'm having issues with the fact that he's already slept with so many girls. I know I shouldn't let it get to me but I do.  I'm a jealous person. I'm not worried of him cheating on me just jealous that everyone else has had him before me.