For me, there are many reasons why I cannot do relationships but here are a couple of the main ones:

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One of the first major reasons I cannot do relationships is because the thought of kissing a woman who has had someone else's dick in her mouth or has been used by someone else disgusts me, perhaps it is just me but I just couldn't handle having someone else's leftovers.

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Second of the major reasons I cannot do relationships is because I like my own space, I like being alone and doing my own thing, perhaps it is selfish in a way but I do not and would not want to have to share with someone else or make compromises or anything like that. I want to live my life my way and I believe I would not be able to do that if I was in a relationship.