Holiday Breakup tips

My boyfriend has been being dishonest and I’m more than positive he has been cheating on me with his best friend. We had plans for the holidays as i don’t really have much family to spend them with and now he has broken up with me because he’s tired of me questioning the relationship with his “best friend.” I’ve been in the bed for days just thinking and trying to get through it all and just wanted some advice on healthy coping after break ups. Thank you.

P.S. Before anyone gives me shit for questioning the relationship with his best friend I’ll just give a few reasons why i have. He tried to hide when he is with her, he won’t answer her phone calls if I’m around, he won’t answer mine when she’s around, she’s always visiting him, has slept in his bed, popped up at his house while we were in bed at 2 am... need i go on...