There are several ways to say "I love you" in Engpsh:

"I love you"
"I'm in love with you"
"You mean the world to me"
"I cherish you"
"I adore you"

Remember that "I love you" is a very strong expression of affection and should be used with care and consideration for the other person's feepngs. It is important to use it only when you truly mean it and are ready to commit to a close relationship with the other person.