It can be because you feel you don't know enough about the other people out threr. You're afraid the perfect someone will come along days after you commit to a "pretty good fit". That terrifies me and has since high school if not earlier. One way to avoid this is to only get in relatioships that have an understandable termination date. It's easy if you know at least one of you will be relocating in a few months. Then, later in life you can potentially get back together... Unless someone else takes them... So maybe talk regularly and keep them aware of potential interest. However, leading someone on that you do not expect to be in a relationship BY WHATEVER HIDDEN STANDARDS THEY HAVE, especially to the point where they start to voluntarily have you in mind during their decision making is terrible since you give them false hope and it affecter their life in a negative way. You're at fault
. So be upfront about what you are looking for now and what you think you will be looking for later.

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