My friend (Girl) has started avoiding me after I asked her out. What’s next?

Neglect Show you don’t give a shit and yes,don’t give a shit even! Join a gym,get a hobby. Tease her evry 15 days or so. Flirt with a lot of other girls so that she knows you have moved on. Make her insecure and jealous. Jealousy is the best catalyst for lost love!