Formal:
* मुझे हमेशा आपकी याद आएगी (mujhe hamesha aapki yaad aayegi) - This is the most literal translation and means "I will always remember you."
* आपकी कमी हमेशा खलती रहेगी (aapki kami hamesha khalti rahegi) - This means "Your absence will always be felt."
Informal:
* मैं तुम्हें बहुत याद करूंगा (main tumhen bahut yaad karunga) - This translates to "I will miss you a lot."
* तुम्हारी याद हमेशा रहेगी (tumhari yaad hamesha rahegi) - This means "Your memory will always stay with me."
Poetic/Emotional:
* तुम्हारी यादें मेरे दिल में हमेशा रहेंगी (tumhari yaaden mere dil mein hamesha rahengi) - This means "Your memories will always remain in my heart."
You can choose the option that best suits the situation and the person you are speaking to.