Can doubt after a spell affect it?

Kind of a weird question but let’s say for example you do a spell to bring new love into your life and then not long after that you meet a person that you really hit it off with. However, let’s say you begin to have doubts and worry that the spell is gonna wear off or something like that. Could this have an actual negative effect on the results and cause what you have to fade away? Any insight would be appreciated.