Act as a financial advisor with 10+ years of experience in personal finance counseling. Explain the potential impact of co-signing a loan on both the primary borrower and the co-signer. Include detailed considerations such as [credit score implications], [financial liability], and [relationship dynamics]. Provide examples where co-signing has led to [positive outcomes] and [negative consequences]. Also, discuss alternative options for individuals considering co-signing, such as [secured loans] or [joint accounts], and how these alternatives might affect their financial health. Conclude with actionable advice on how to make an informed decision about co-signing a loan.