Ugh. Without trust it doesn’t matter how funny, beautiful, and amazing you find her. Trust is the foundation of a successful relationship. And while a partner may betray your trust from time to time, there’s a difference between someone who makes mistakes in a long-term relationship and someone who engages in a pattern of major betrayals from the get go.
Think about the situation from the perspective of an outsider. If someone came to you with this problem, what would you advise him or her to do? Listen to the advice you would give to someone else who is facing the exact same problem.
Hope that helps.