I work as a Marketing Consultant within a small agency in Australia. I've been there for 4 years and recently was given the opportunity to manage the marketing account for a new client. After working with them for several weeks, my client started hinting he wants someone 'in house', and then he verbally offered me the role and the amount he offered was nearly double what I get paid! At first I was concerned about the situation so I kind of brushed off the conversation, but thinking about it more, I've realised that it's too good of an opportunity to miss.
I've always felt loyal to my current employee, but they do drastically under pay for this industry. There's nothing in my contract about this kind of thing, but I also don't want to ruin my relationship with my current employer, or my client. My questions are... What do I do next? How do I find out if it's a genuine offer, without risking my current role? And then how do I approach it with my employer? Thanks