Hi Lorm

Thoughts are a happening. The more you try or will yourself not to engage some thought the longer it lingers. Frustrating as from the point of view of the mind trying our not trying to engage with a though is the same thing. In both cases your holding on to it and blocking flow.

As Helcat mentioned Meditation techniques could help. “Oh here is that fantasy again”, engage or don’t engage, whatever you choose do so without judgment as it the judgment that clings to such things and prevents flow.

You might notice that when you don’t apply judgments to having the fantasy you might go a step further and examine the judgments your making about the fantasies your having, the desire for relationship. In the fantasy what are you labeling as good, bad, if only, shoulds…  At that point you might make such judgements conscious and being conscious allow them to inform you vice block you.

A fantasy becomes unskillful when it becomes a trick used to hide away from life rather then engaging with life. In a fantasy world one appears to a have more control so it may ‘feel’ safer, and being safer can become a pleasant trap.  My owe experience with getting stuck in fantasy has been linked to a desire of the ego for control (both illusions). Something one can address in meditation.