Will you swear off all ENTPs based on the experience with one? That the ENTP could break your heart meant that you loved him a great deal. Those things which make you love the person, they'd not have changed. And you'd probably find them in others as well.
If you learn from what made your heart break, and apply it to your next relationship with an ENTP
nudge nudge, then you'll be happier.
Noone can ever change us. We have to read/hear/watch something that instigates us to change ourselves. For someone to say to us that they want to change us, is for them to tell us they don't like us for who we are.
We're all about growth. Growth is the path of perfection, stability is the way of retardation. But noone can "change us".