Contagious

The speaker feels intensely drawn to someone but becomes nervous whenever they are near him. At first, she cannot think of what to say and leaves without speaking. As she reflects, she recognizes how strongly he affects her. Although other people warn her that he may be bad for her, she is not ready to give up, and she ends by asking for a chance to prove that she would treat him well.

Calling the feeling “contagious” suggests that it spreads through her thoughts and is difficult to escape, rather than describing a literal illness. The contrast between making her “cry” and making her “smile” shows that this attraction brings both hurt and happiness. Saying he makes her feel “high” is an informal way to describe intense excitement or joy, not necessarily a reference to drugs.

The lyrics present infatuation as powerful and somewhat unreasonable: the speaker feels certain she has “figured out” the man, yet the warnings from others remain unresolved. Her confidence may be sincere, or it may be a way to defend a choice she already wants to make. The song does not explain why others think he is no good, so it leaves open whether this romance is promising or risky.