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What's hard is not specifically missing the person.
I mean, yeah, it is, but you could easily trick your mind into thinking about something else, pretending they're away and will be back, or just, take it off the skin like a sticky band-aid. Find solace and comfort in other people.
But the thing is, that whole period when you like someone, you keep associating them to just about anything - obviously, also stuff you like, or that you know they like. Loads of connections have been created that relate the outside world to that person, that would normally have playfully winked at you. But when you're out, it's all plugged off. That person is everywhere, all the time, and very often when you don't expect them and are wandering unprepared. Connections still start in your brain but they fire off in a painful void.