Can someone or multiple people help me? I'm trying to look for mangas similar to silver di...

Hmm i didnt read any of them, but you can try this one.
http://www.mangago.me/read-manga/uragiri_wa_boku_no_namae_wo_shitteiru/
I've read its similar to Silver Diamond. :D

I haven't read Silver Diamond, so I'm not sure what you're looking for. I think these may have sth in common with Super Lovers:
http://www.mangago.me/read-manga/brother_x_brother/
http://www.mangago.me/read-manga/brothers_yamamoto_kotetsuko/
http://www.mangago.me/read-manga/toshishita_no_ryuugi/
Well, the only similarities are that they're about brothers and the developement is kinda slow ;_; So Idk if that's what you meant

This one is the closest I can think of at the moment http://www.mangago.me/read-manga/komatta_toki_ni_wa_hoshi_ni_kike/
And if you don't mind shoujo http://www.mangago.me/read-manga/akatsuki_no_yona/
Best i can come up with right now :)

I'm sorry I've already this T-T

I'm sorry I've read all three multiple times T-T

Both of those are in my top favorite mangas already T-T

http://www.mangago.me/read-manga/jinjuu_houretsuden/

http://www.mangago.me/read-manga/crimson/

That's too bad, sorry I wasn't of much help ;_;

http://www.mangago.me/read-manga/pure_blood/