Feeling Lost and Alone After a Breakup

I feel so lost and alone right now. I feel like I'm drowning, and there's nothing or nobody there to save me. I recently lost my boyfriend a year and a 1/2 over some very stupid things, and we agreed to just be friends, but I don't exist to him anymore, basically. I feel like with that, I've been burdening my friends cause I keep talking to them about it. I feel like that partially because I have a triangle best friend group, and as of this week, we all just lost our relationships. What makes matters worse is the guy I was dating is my best friends brother, so I feel so bad talking to her about it. So we are all having a really hard time, and I feel like I've been self-centered about it, and like I'm not, they're enough for them, and I feel so alone. I just want the pain to go away. I'm trying....... But I just can't stay a float...... There's nobody there to throw a life raft.... Does it ever get better..... Will I ever be healthy..... Does this pain go away, and will I be able to think about him without wanting to cry or hit throw or punch something