4. When she seems absent-minded while he talks to her
When a girl is silent, or just absent-mindedly nods when her boyfriend is talking, it can make him think her feelings for him have cooled. If you don’t respond when he’s talking to you, you may make him unnecessarily anxious. “Am I boring?” “Maybe she’s not interested in me.” Try to find points of conversation that you can share and listen to attentively; by responding with an appropriate level of interest, you can put his mind at ease (“She understands me!”).