Powerful spells to make someone dream of you
Find a time when you are sure the person is asleep. Generally, for most people with somewhat normal sleep schedules, you can count on 3 am as being a good time. You can do it closer to the time they will wake up. They will remember it better, but you will be taking a risk. They may wake up before you finish, or they might even awaken before you begin. This is not a good thing - when you are trying to send a dream to someone, and they are awake, it will often make them feel negative towards you. Subconsciously, it gets them in "You are invading my mind!" mode. They won't know why, but they might feel odd around you.
That aside, you are probably eager to know where to begin!
It's a good idea to sleep before the hour when you will perform the meditation. Sleep for 4 or 5 hours and set an alarm to wake you at whatever time you chose as ideally, being when the target is asleep. When you are awakened by the alarm at that time, get up and stretch, walk around your room a bit and get a drink if you need to. You shouldn't be unable to get back to sleep, but you should be aware enough that your mind is working.
How to make him never to dream about any other person or relationships
Get comfortable again in bed and lay in your normal sleeping position. From dream meditation, you should fall asleep. In fact, you should fall asleep during it, believe it or not!
Now you must get a perfect, clear visualization of the person. Use all those characteristics mentioned before to create the person in your mind - posture, looks, clothes, etc.. Now focus on contacting that person. Think of their name over and over again, keeping their image in your mind. Be 'looking' into the eyes of the person in your mind. You will feel it when the contact is picked up - if they are asleep. You will feel a slight surge of energy and a strange sensation, at this point, your minds are hooked up. It's easier to make this connection than it is to maintain it.