For Marriage
They are by no means at your level (Shan). Do not "lean against the wind" (trust the unstable); it leads to severe regret. Definitely abandon it.
For Business / Deal
It involves severe financial and reputational loss. Your counterparts are not people who stand by their word. Definitely abandon it.
فَمَا تَنفَعُهُمْ شَفَاعَةُ الشَّافِعِينَ
Fama tanfaAAuhum shafaAAatu alshshafiAAeena
Then will no intercession of (any) intercessors profit them.
