Direct translations:
* Aliniiba moyo wangu: This literally translates to "He/She stole my heart".
* Alichukua moyo wangu: This translates to "He/She took my heart".
More poetic and metaphorical options:
* Amenivuta moyo wangu: This means "He/She attracted my heart" and is a more poetic way of saying "stole my heart".
* Amefanya moyo wangu kupiga kwa furaha: This translates to "He/She made my heart beat with joy" and suggests a feeling of happiness and love.
* Amekuja katika maisha yangu na kubadilisha kila kitu: This means "He/She came into my life and changed everything" and implies a profound impact on your life.
The best option to use will depend on the specific context and tone you want to convey.