Your straight question has been, will therapy help in dealing with breakup-related emotional issues? The answer is, YES.
A breakup involves a lot of emotions like the sense of rejection or abandonment, pain of betrayal, anger, jealousy, a sense of loss etc. In the case of almost all individuals suffering the pain of breakup, the hurt mind will refuse to accept the fact that this too will pass. Time heals everything, even though it may leave some scars. The healing becomes faster if one has someone close and trustworthy enough to share the feelings and communications with such a person will sooth the mind. Keeping aloof does not help at all. Get engaged in any meaningful activity that can occupy your mind constructively. Pick up the threads of life and move on. Communicating with people around, engaging in some hobbies etc. could be helpful too.
Trying to cope with your current state of mind on your own will be most desirable, if you are able to do so without any distress. Yet, if you find it difficult, please seek a few therapy sessions from an experienced psychologist.
Next Steps
Please consult a psychologist, if required.