What does it mean to give someone mixed signals?

: a showing of thoughts or feelings that are very different from each other I dont know if he likes me; he keeps giving me mixed messages. Shes sending mixed signals about her feelings.

Why do I have mixed feelings about him?

When you have mixed feelings for someone, it means that youre unsure if you are romantically attracted to them or not. When you have mixed emotions toward someone, its because youre feeling both positive and negative feelings about them. You are worried that your romantic attraction isnt enough.