1 Question: Is it permissible for a boy of fifteen years to have a girlfriend?
Answer: Friendship with a non-Mahram is not allowed.sistani.org/15365
2 Question: Is it permissible for a Muslim to have a non-Muslim friend?
Answer: A Muslim is allowed to take non-Muslims for acquaintances and friends, to be sincere towards them and they be sincere towards him, to help one another in fulfilling the needs of this life.sistani.org/15366
3 Question: Is it permissible to exchange greetings and gifts with a non-Muslim, if he is a neighbour or a co-worker, etc.?
Answer: If he does not express hatred towards Islam and Muslims in words or actions, there is no problem in doing what is required in friendship like being good and charitable towards him.sistani.org/15368
4 Question: I have a girlfriend whom I like to marry in future, can I express my love to her?
Answer: All kinds of relationship with a girl including joking, expressing love and becoming intimate are forbidden, before consuming the marriage contract (Nikah)sistani.org/25314