Friendship can turn into love when two people develop a deep emotional connection and bond with each other. Over time, they may come to realize that they have strong feelings for each other that go beyond just friendship. This can happen when they start to see each other in a romantic light, and begin to develop feelings of attraction, admiration, and affection towards each other. Additionally, shared experiences, trust, and understanding can also play a role in deepening the bond between friends and turning it into love.