Having fantasies might be a guilty pleasure that your partner isn’t particularly proud of and hence, they might subtly hint about their fantasies to you.
If your partner is fantasizing about someone else, then they will often be lost in another world when they are with you.
Checking out other people can be perfectly harmless in a relationship. Some couples may even check out other people together. However, there has to be a certain level of honesty and trust for this to exist.
If your partner is often dressing up, making active changes to their physical appearance, and looking their best, it may be a sign that they are trying to gain the attention of the people they are fantasizing about.
A classic sign that they are fantasizing about other people is if they are constantly spending time with themselves. They may become more private and quiet around you.
This is a more elaborate manifestation of feeling disconnected from you. They may feel disinterested in being intimate with you and may even choose to sleep in a different bedroom.
Dishonesty is the root of most troubles in a relationship. If they are fantasizing about other people, they may become extremely protective and defensive of their things.
This is perhaps one of the most obvious signs of them fantasizing about someone else. Apart from becoming more private and secretive, they will also be extremely reluctant to spend quality time with you.