Lucy Burroughs answered
It sounds to me like you have trust issues. Has your partner ever given you any reason not to trust them? If they've cheated on you in the past, or flirted with other people in front of you, then I can understand why you might be having such dreams.
What If My Partner's Never Cheated? Has a lover broken your trust in the past? If so, try to rationalize your insecurities. You may have been cheated on before, but not every person is the same. Just because one person has been deceitful, it doesn't mean everybody is!
When someone does something to hurt you in your dream, it's easy to carry a grudge into the next day - even when that person has done nothing wrong in reality! Try to be aware of this, and don't resent your partner for what they did in your dream. It's your subconscious that's hurting you, not them!
How Can I Stop Having These Dreams? You need to address your trust issues. It might help to talk about this - either with your partner, or with a therapist or a friend. Don't tell your partner that you don't trust them straight out, as they're likely to take offense.
Trust is very important in a relationship, and if it's not there, then maybe you should consider dating someone who you can trust.
What If My Partner's Never Cheated? Has a lover broken your trust in the past? If so, try to rationalize your insecurities. You may have been cheated on before, but not every person is the same. Just because one person has been deceitful, it doesn't mean everybody is!
When someone does something to hurt you in your dream, it's easy to carry a grudge into the next day - even when that person has done nothing wrong in reality! Try to be aware of this, and don't resent your partner for what they did in your dream. It's your subconscious that's hurting you, not them!
How Can I Stop Having These Dreams? You need to address your trust issues. It might help to talk about this - either with your partner, or with a therapist or a friend. Don't tell your partner that you don't trust them straight out, as they're likely to take offense.
Trust is very important in a relationship, and if it's not there, then maybe you should consider dating someone who you can trust.