Ebb is the flowing back of the tide away from the coast and towards the sea. With reference to life, anything ebbing means it is declining, gradually fading away or becoming smaller. Flow is the incoming phase of water to the shore which brings about its rising. Ebb and flow signify ups and downs of life.
Obsession is having your mind preoccupied with something or someone so much that you cannot stop thinking of it. It can result in one being unhealthily devoted to something. It can also lead to unreasonable or unhealthy ideas and feelings about someone or something.