"I expect to you see you" sounds like you are demanding or insisting that they see you. For example, you might say, "I expect to see you at my birthday party." That implies that the person needs to come to your birthday party, and if they don't come, you will be mad. You might mean, "I look forward to seeing you," which means "We will probably see each other soon, and I will be happy when we see each other." You might also mean, "I hope to see you soon," which means "We might see each other soon, and I hope that we do."