Dealing with trust issues because of a past relationship

It’s so hard to get over insecurities you develop after being cheated on. Bringing those feelings with you into a new relationship can make it nearly impossible to have a fulfilling and satisfying relationship because you never quite open up yourself to the other person, in fear that you’ll be hurt again.

What are some ways people who have gone through this can heal so that they can someday have a loving and secure relationship again?