Commitment issues

Why is it that, as soon as I like someone for real, I get the irresistible impulse to go sleep with someone else?
Not that I have any obligations, I'm not officially in a relationship, but when I like someone, I sort of want to stick to them, as a sort of test run to see if I still can.
The issue, I suppose, is the fact that I am, for whatever sick reason, unbearably attracted to a particular 16 year old who I would do best in keeping my hands off. I don't know what does it for me, but he makes me blush and unsure of what to say and, well, he makes my mouth water.
I suppose I could do with some entertainment.

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