I'll try to stop by your thread, Maybell. It would depend on how often he sees her, and whether or not he's "dwelling" on her in his mind (example: you don't see her for several months, but every night you're on iTunes playing your favorite love songs that remind you of her, and "going there" in your mind).
Interestingly, it's been shown that even NEGATIVE contact (a disagreement, or a friend telling you something disparaging about OM/OW) can have the same effect as positive contact, chemically. The brain still gets that same "jolt" of PEAs and the withdrawal clock goes back to 0:00:00 again.
