When being very choosy and uncertain about finding only those few people who will go the mile with you, that attitude does inhibit the 'just go with it for a while and see' behaviour. And even with careful consideration, it can turn out to end up nowhere after all. For some, the idea of comitting deeply and fully and investing time and energy into a relationship that doesn't have a realistic chance of lasting is a very repelling one. Either we're 'just having a bit of fun', no promises, no illusions, or we enter the stage of carefully considering whether or not to take the risk of investment.
But if you have us, you have us completely, fussiness and doubts and devotion, the whole package. Take it or leave it, heart handed on a platter.