Hello there.. Any kind of abuse in a relationship, be it physical or mental is difficult to cope with..the cheating and the abusing partner who is displaying a lack of empathy in your case, is leading you to question your own self esteem and this stressor might have precipitated depressive symptoms..consulting a psychiatrist can better help you to identify your own troublesome emotions and help you with healing..

Hello Friend, Good that you are seeking a help here. Any relationship break up will take time to accept the failure and adjust with reality. Yes, Such pain will cause depression and stress. What are you looking for now?. If interested to come out of this mental stress, then take a counseling support. I am sure you will be able to get a clarity about your next steps. Reach me online for further assistance.

Feeling low, having crying spells, sleep and appetite disturbances, and difficulty in concentration and attention are some of the signs of Depression. Consult a Psychiatrist for a detailed assessment. It is likely with medication and counselings the symptoms will improve. If you are feeling suicidal or hopeless consult a Psychiatrist immediately.

I suggest you to consult a psychologist for more clarity and understanding.