It is also clearly stated that she thinks he might have never loved her. It is also only said he told her about his frustration (nothing about the degree of how he tries to coerce her). Men, at least the ones I've met, tend to get frustrated, when you keep postponing something (work, trips, whatever, sex in this case) without being clear. Basically he just wants a confirmation if it's going to happen or not. If he should keep on waiting.