Codependency Support Group
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That is hormones and not love.
At your age the hormones are super strong and your body is just making demands onto you (and his hormones too) and you both are being controlled by your sexual apatite.
Brain says no - body says yes - hormones are constantly both night and day making demands on our animal instincts.
A boundary is where we use our brain to control our body, so telling "no" to your desires is the healthiest boundary of them all.
When you miss him it might feel like it is in your mind while the missing is really a chemical reaction called hormones.
See in this link see specifically # 5 and # 6
http://www.wikihow.com/Understand-Love-As-a-Chemical-Reaction
Just saying.