It can be challenging when someone you love doesn't believe in you, but there are some steps you can take to address this issue:

1. Reflect on yourself: Start by evaluating your actions and behavior towards the person you love. Have you been trustworthy, reliable, and consistent? Ensure that you are demonstrating qualities that inspire trust and belief in you.
2. Open communication: Initiate an open and honest conversation with the person, expressing your feelings and concerns. Ask them why they don't believe in you and listen attentively to their perspective without becoming defensive. This will allow you to understand their doubts and work towards resolving them.
3. Build trust: Building trust takes time and effort. Show your loved one that you are dependable by following through on your promises. Be accountable for your actions and communicate openly and transparently. Consistency is key in establishing trust.
4. Showcase your achievements: Actions often speak louder than words. Take the opportunity to impress the person with your achievements and successes. Demonstrating your capabilities and character can gradually instill belief in you.
5. Be patient and understanding: Changing someone's perception takes time. Understand that their lack of belief may be rooted in their past experiences or personal fears. Be patient in addressing their concerns and be understanding of their emotions throughout the process.
6. Seek counseling or therapy: If the lack of belief in you continues to persist, consider seeking professional help. A professional counselor or therapist can assist and guide both of you in navigating this issue and finding resolutions.
7. Self-improvement: Focus on personal growth and self-improvement. Engage in activities that boost your self-confidence, self-esteem, and overall well-being. By working on yourself, you can become more resilient and better equipped to handle challenges in your relationship.

Remember, maintaining a healthy and trusting relationship requires open communication, understanding, and patience. It is essential to address any issues that arise promptly and work together with your partner to find resolutions.