I have a Frangipani bush that is about 3 years old. It flowered beautifully the first year, but the past two years it hasn't. Instead, it's just grown enormous.
Why Isn’t My Frangipani Flowering
Certified GKH Gardening Expert
It sounds like it may have too much nitrogen. When a plant has too much nitrogen, it will grow lush and large but will get few flowers. If you are using fertilizer on it right now, cut back. Also add some phosphorous to the soil to help balance the nitrogen and phosphorous. Phosphorous will help get the plant blooming again.