I don't know if it was strung out, but two come to mind in my early 20's (neither one I slept with).
Guy #1 worked for the same company I was with, he called me a few times, we had breakfast together before work a couple of times, I told him that although he was a nice guy, I wasn't interested in a relationship with him and he started crying on the phone
erplexed.
Guy #2 was introduced to me by a relative--he started off being really smothering and it scared me a little. We had gone on a few dates, but again, I wasn't interested, I don't believe in stringing guys along, and I told him that it wouldn't work out. My relative told me that for a few weeks after I told him that, he was very sad and
he rode around in his truck with a big teddy bear on the passenger side that was a replacement for me
Please keep in mind that I didn't have any physical contact with either of these guys so I didn't get it.