Rapture by Susan Minot

 

"Not only did he need to prove to Vanessa that he had been worth sticking with, but he needed to address the panic that this would, unless he put a stop to it, keep happening. He would keep falling in love with women. He would love one woman for a few years like he had Vanessa till things got a little regular, then another woman like Kay would appear and he'd fall in love with her, and even if he never actually fell in love with any woman ever again, he was pretty sure he wouldn't be able to say no to the occasional temptation. He didn't see how he'd be able to help himself. He figured he'd better stop it now and try to stick with one woman."