Is your partner loyal to you?
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What does your partner like the most about you?
How do you behave when you face a problem?
Does your partner put more effort than usual in dressing up before going out?
Who does your partner have sexual fantasies with?
Are you jealous with your partner?
Does your partner use more perfume than usual?
How often do you have sex?
Does your partner get calls that he/she doesn't answer when he/she is with you?
Does your partner get upset if he/she sees you near his/her phone?
Does your partner arrive home later than he/she used to?
There is a good chance that your partner is cheating on you. There are a lot of behavior patterns that indicate the first stage of a romance they're trying to hide. However, keep in mind that this is just a test and there might be another explanation behind this change of behavior. Talk to your partner and clear any kind of doubts.
Another person might be in your partner's mind. He/She might be falling in love with someone else or might be suffering from sexual temptation. You should pay attention to these clues but, above all, speak with your partner about this.
You shouldn't worry about this. There's no proof your partner might be in another relationship. However, this is only a test, and it might be otherwise in reality. Anyhow, speaking is the best way of clearing any doubts.