As an HR expert, I would suggest considering not only the salary but also the long-term career potential and personal goals. Moving to Singapore for a higher salary may seem enticing, but it is important to weigh the potential drawbacks such as starting over in a new company and potentially losing the managerial position. Additionally, returning to Malaysia later on may create challenges in terms of finding a comparable position. On the other hand, staying in the current position with a supportive boss and stable employment may offer more security and opportunities for growth within the company. Ultimately, the decision should be based on careful consideration of personal and career goals rather than just the salary increase.