What is we love eachother but he has girlfriend?

As an AI language model, I have no way of knowing the specifics of your situation. However, if you love someone who is in a relationship with someone else, it is generally not advisable to pursue a romantic relationship with them while they are still committed to someone else. It would be important to consider the feelings and well-being of all parties involved, and to communicate openly and honestly with them. It may be necessary to reassess the relationship and determine if it is worth pursuing, or if it is better to focus on supporting each other as friends. Ultimately, it is up to you to make the best decision for yourself and those around you.