You know he's only in touch with you because he's using you (otherwise you wouldn't mention your lack of friends as your reason for going along with his stalking). That's too sad a situation, and even sadder that you don't even mention harming her as something that pains you. You only seem worried about getting caught and about not being alone.
By the way, being an accomplice is, needless to say, a crime according to the law, so you've been committing a crime. Excuse me, but I don't think you should come to WP asking whether to continue committing a crime or not. I think you should leave us out of it.
You're not a confused teenager, you're almost 30.
I really hope this thread is locked.
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So-called white lies are like fake jewelry. Adorn yourself with them if you must, but expect to look cheap to a connoisseur.