Tell your jealous boyfriend to learn to dance, then. That way you will have an amateur partner if you ever decided to compete, and along the way you will save a lot of money. With two people you can split the cost of private lessons (it's the same price for one person dancing with their teacher or for a couple dancing together with a teacher helping them). Also, amateur competitions tend to be a LOT less expensive to enter than competitions where the student dances with his or her teacher.
But best of all, you'll get to do something together! And if he thinks dancing is for sissy boys, promise him you'll never make him wear a Latin shirt open down to his navel, and show him the hot dresses that the women wear :)
Good luck!