The above is good advice. Just keep in mind that you are the most important person in your life, and you need to do what's right for you. Your concern for his feelings is admirable, but if you don't do what you need because you're putting them ahead of your own, in the long run that's likely to doom the relationship anyway. If he genuinely cares about you, he'll want you to do what's best for your happiness, but at the same time, you need to be honest with him: you can't control how he feels about what you're doing, and the more open you both are with each other, the better the outcome will be -- even if it's not the one you want now.