Severe anxiety and depression. His ex.

Marriage is a big decision. You have to have some assurance before getting into such a commitment that your partner will not hurt you or treat you badly. Given the current situation, you need to take a step back and assess the circumstances carefully. Your mental peace and stability is more important than getting married. If required, consider putting things on hold before taking a decision. You can also consider approaching a counselor or Psychologist to help work things out. Having an unreliable, unfaithful partner will be very stressful, and you may have trouble trusting him in the future. Outcome of any relationship is always unpredictable but in such a situation where you have already been cheated on once, you need to take a hard look at why you would be willing to continue this relationship. Your mental, emotional and physical health and safety is the most important thing; consider terminating the relationship if any of these are threatened.