According to the internet, 303 is 'Mom' or the angel number, and 25519 is 'yes'. All for different reasons; 143 is the number of letters in each word, 'I' is 1, 'love' is 4, 'you' is 3. 303 is from numerology. 25519 is the number of the letter; y is the 25th letter of the alphabet, e is 5th, s is 19th.