Please give advice

A while back (A month ago) my boyfriend of four years left me for someone else. Someone who could “make him happy” I thought I made him happy. It hurt, it hurt so badly it drove me to almost committing suicide. I’m 15 and I felt as is I could not live without him at the time. I’m “fine” now btw. I’ve always had horrible mental health issues. My moms entire family have bipolar disorder and she thinks I have it as well. I see a therapist and idk if I should tell her about this but I might.

I’m getting off track hold on....

I told my best friend grant that I wanted to die. I sent him a very very very long story about how I couldn’t bare to live anymore. He left me on open and said he wasn’t reading it because it was longer than a novel. I asked him to read at least a sentence, he said no because he was doing something. It broke my heart. I told him he was on the same level as my ex and a horrible best friend. He made me want to die even more. I felt as if no one cared about me. These two people were all I had. My boyfriend and my best friend are both gone.

I blocked him and I unblocked him a week ago and every day since I have apologized. He has not written back one time for a whole week. I know he sounds like a shitty person but he isn’t. I know you might say “he’s not a real friend” but he’s a teenage guy and he’s just stupid as hell and he’s also my cousin soooo we’re family.

I’m just so hurt that he won’t talk to me.

He leaves me on open every time I message him.

I’m really sad about my boyfriend still. I don’t even remember my life without him in it so I’m having to completely renovate myself. I know I’m so young but love comes at any age. He wasn’t only my boyfriend he was my absolute best friend and we did everything together. We were together since I was 12 years old and it would’ve been 5 years in December. He got with someone the day after he broke up with me. I’ve heard this happen to a lot of people on here and it sucks so much. I cry everyday about it.