Thats a classic symptom of lack of light. These are not indoor plants and need real sunlight, and a like a cold period in winter. Dont just stick it in full sun, see if u can get it outside in bright shade and gradually acclimate it to full sun over the course of a week or so. Also if possible make sure drainage is good for an outdoor container, and use some small gravel mixed into the soil if re-potting for outdoors.
