Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: You know you're in love when all you can do is smile whenever you talk about how he is to someone.
This tweet contains emotions: 
joy, love, optimism