Picking fights serves multiple purposes in a cheating situation. As a starter, it’s a way to try and get your partner to leave you. This absolves the cheater of guilt for ruining the relationship. Secondly, picking fights for random things will divert your attention from the real problem at hand – the fact that they are cheaters. Cheaters will want to pick fights to keep the attention on the relationship and also to help you feel that the problems are just between the two of you. If you notice small thing being blown out of proportion and being escalated into full fights for no reason, there may be something else going on.