When people confess their feelings at an inopportune time
Such as after months or a year+ working/studying together and you're about to go to two totally different places. Because what... was the point? You just felt you needed to get that off of your chest? It feels weirdly manipulative. What do you expect me to do with that information now? If you were sincere, you would have told me earlier, no? You would have wanted to see if this could have gone somewhere, but no. You sat on that ridiculous nonsense for that long, swallow it, and leave me out of it.