Please, help to translate these sentences
Hello everyone ~ I hope someone here can help me:
1. "I hate when people say 'I love you' without strong feeling in the heart. If you forget this person after some time, you better be silent"
2. "We never will be together.. Love is silly.. I must forget you..."
3. "Please, look at me!! I feel as if I do not exist ㅠㅠ Am I invisible?? "
Please, translate informally. Thank you in advance!