Breakup 💔

How can I move on over my ex ? Its hard for me to be friends with him and he acts like he doesn’t care about me or miss me and he already move on talking someone different state 😪 and my sister inviting me to her boyfriend party and my ex’s gunna be there idk if I wanna go it’s gunna werid you know and I still love him and care abut him and I lost my virginity to me 💔😥