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It's a little too vague, so I can't tell you what's wrong. Some possibilities might be that you start appearing insecure, or that you have attraction, but fail to escalate into something more physical.
It might also just be that you're unconsciously dating girls that are actively looking for relationships, which is okay if the situation is the same for you, but if you're trying to get laid and you're "relationship dating" her, the question for her goes from "Do I want to fuck him" into "Do I want a relationship with him". This is an issue because she might have fucked you, without there being anything long term in it for her, but that option is off the table because it's now inherently linked with having a relationship with you.
However without any additional information it's really, really hard to pinpoint the problem.
Last time it happened because we couldn't arrange where to go and what to do and couldn't fit each other into each other schedule. I'm very busy as well as she. And I know its my responsibility to handle this, because I'm the man and I should lead the relationship. I couldn't manage to do it and she turned disinterested and eventually gave me LJBF. Now she is disinterested.