lovestipation
An inability to behave romantically out of some sort of fear of looking weak, or of getting ridiculed, or of only wanting to say certain things to or do certain things with "the one" and feeling dubious about the current significant other being it.
Jack was experiencing lovestipation with Mary to the point of treating her as a mere acquaintance in public even after a full year of dating, but he got over it by the time they got married.