Yes, it does. But remember, not all Karma is bad. I am Buddhist and according to Buddhism, inequality in everyone's life is due not only to heredity, environment, "nature and nurture", but also to Karma. In other words, it is the result of our own past actions and our own present doings. We ourselves are responsible for our own happiness and misery. We create our own Heaven. We create our own Hell. We are the architects of our own fate.
My husband has had Karma hurt and benefit him since his A. It hurt him by having all of the OWs find out about each other, his adult children being furious with him, and some close friends wonder how he could be so despicable. On the flip side, once he began working on himself and started making better choices, Karma improved for him. His relationship with his children improved, his true friends remained friends, while the "fake" friends went to the wayside. The OW he cheated with didn't "know" this new person and left him alone once he made it known that they were all horrible choices that he had made and no longer (and probably never truly did) had real feelings for them. I think his life i so much better now that he has become truthful to himself. We still have a lot of work to do in our R (I am finding it to be a challenge to do as the teachings say, and forgive completely, but that is my struggle to overcome.), but it is getting better everyday.