I don't believe you can "make" yourself trust another person anymore than you can make yourself fall "in love" with someone.
Trust like respect is something that is usually gained overtime. A person has to "demonstrate" honesty and integrity. For how long? It varies from person to person.
As for having been hurt in the past and applying it to a current relationship....etc The trust issue is really about the (individual) trusting (them self) choose a "trustworthy" mate the next time around.
Until you (believe) again that (you) are a "good judge of character" when it comes to selecting a mate for yourself, you're not likely to trust anyone!
If I don't (trust myself) to (choose) women with a pure heart there is nothing those women can say or do to convince me otherwise. It takes time to rebuild your confidence in your dating choices. You also have to bury your past relationship by seeing your ex as an (individual) not as a representation of their whole gender.