WHat should I do about my parakeets? PLEASE HELP!?

I have two parakeets- one boy and one girl. I got Sam, the boy, this last July or August, and I got Lea, the girl, 5 or 6 weeks ago. When I first introduced them, they seemed to REALLY like each other. For the first couple of weeks, they got along fine. But for the past 2 or 3 weeks, Sam has been very territorial about a lot of things. For example, When iset them on my shoulder, Sam likes to rummage around in my ear. I also allowed Lea to do this, but Sam shooed her away, and pecked at her angrily. Sam is laso very territorial about food, perches and who knows what else. Occasinally, Lea pecks back angrily at Sam. When I try to let Lea eat out of a seperate bowl, or sit on my other shoulder, Sam goes over to Lea, and gets territorial again. I have tried separating them, but they dont like being apart. When I take just one of them with me, or put one of them somewhere else, Sam and Lea start Chirping for each other, and fly over to each other. I don't want to get rid of either of them, but I just don't Know what to do. does it have anything to do with clipping their wings, because I have not clipped either of their wings in quite a while, but Sam's wings are considerably longer than Lea's. Please help me!