I have lost my internal tranquility after breakup with my ex. What should I do?

I have just lost my life energy after breakup with my last ex girlfriend three months ago because of her misunderstanding me that I had messaged one of my friend as like "you are wonderful" for her artwork as to why she had performed great drawing. When she saw my message to her then she supposedly though that I could have cheated on her then breakup with me for that reason. We had been together for 5 months and I got terribly ruined in afterwards then lost my job too owing to the lack of my concentration. I can't recover myself.. Any suggestions?

I have lost my internal tranquility after breakup with my ex. What should I do?
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