Learn to understand the melancholic, although this is very difficult. They are often closed in their own world, and you have to put a lot of effort to achieve their trust.
Keep some distance between you. Melancholic not like it when someone invades their personal space, so stay away from them at arm's length. Try not to touch their stuff because to them they are also very jealous.
Carefully watch your language and tone. Avoid ambiguous phrases, because the melancholic may not correctly understand you and be offended. They are very closely watching your behavior and draw conclusions. Even if you throw a quick glance at the clock during the conversation, the melancholic may decide that you're bored with the conversation.
Do not speak too quickly, clearly and to the point. They don't like long-winded speeches about nothing: do not ramble. Too long conversations wearing them, they feel tired and want to be alone. Do not impose their society, if they feel that person wants to be alone. Never criticize or speak up about it too sharply.
Observe his gestures and movements: they help to understand what not to say melancholic. A sign of excitement, irritation or hostility can serve his nervous movements, for example, he will hold in his hands the handle or thoroughly clean the countertop. If he straightens his hair or smooth hair, it means something alarming.
Be patient and do not rush things, let the melancholic to open with appropriate speed. Try to be kind to him, be understanding, sympathize, and try to lighten the mood. When it unfold in front of you and begin to trust, you will appreciate its great inner peace and get a good, loyal friend.