How to get over it?

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I've never been the type to fall for someone. Most relationships I've had have been relatively short and I never seem to find a full package relationship (i.e., I've dated people where the sex is good but I don't like the personality, or the personality is good the girl has no prospects).

Last year I met someone who I fell hard for - we both did - long distance. We bonded over sharing our personal shit and realised we had so much in common it was scary. The relationship hit every mark and we both recognised how we'd never had such good sex, or companionship, or just mutual interests. We spent half a year constantly messaging or calling, counting down the days till our visits and making all kinds of plans, until she fell into a depressive spiral with elements of dissociation and said she couldn't carry on. She lives with her parents, quit her job, spends most days secluded, and can barely carry a conversation.

I want to help her feel better and part of me wants us to be able to be together again when she is but I realise it's most likely not going to happen. The long distance makes it easy to not see her but it's been over 2 months since we were last together and I cannot stop thinking about her. I don't want to see anyone else and the thought makes me sick.

How do I stop missing her? How do I get over the feeling she was the one?