Need some advice

Moni

So I've liked this guy for a really long time and I've never been able to get up the courage to tell him how I feel. He use to have a huge crush on me a year ago and I think that's what made me feel different about him recently. But a couple of days ago he started dating this really rude girl out of the blue qns he's telling people that he doesn't like her and wants to end it because he was desperate so he went to her as soon as she started texting her. Idk why to do in my situation I see my crush like everyday so that's a bonus but I need some advice on how to make him like me so if u have any tips please leave a comment would be much appreciated thanks ❤️