Here are some tips to help you maintain a healthy and happy long-distance relationship:

1. Be open to each other. It's important to talk to each other about your feelings and thoughts. If you feel lonely or worried about something, feel free to share it with your partner.

2. Find time for communication. Even if you live in different time zones, take the time to communicate with each other. It can be a daily call or a video chat that will help you feel closer to each other.

3. Maintain romance. Do not forget about romance, even if you are at a distance from each other. Send each other gifts, letters and photos to keep in touch between you.

4. Trust each other. Trust is a key element of a healthy long–distance relationship. Make sure that you trust your partner and that he trusts you.

5. Plan meetings. Take the time and opportunity to meet in person to strengthen your relationship. Plan your meetings in advance to make sure you have enough time to prepare and organize your trip.

Long-distance relationships can be difficult, but they can also be very successful if you are willing to work on your relationship and keep in touch with each other. Don't forget about love and trust, which are the main elements of a healthy long-distance relationship.