Hello, I’d like to help you with your question.
When you know your relationship is ending it is usually a good idea to end it as soon as possible. If you wait, it only hurts you and your partner may be able to pick up signals that you are not involved in the relationship as much as you used to be which can add to their pain over the end of the relationship.
Ending a relationship involves mourning your loss. Even if you want the relationship to end, it is still a loss. And grieving does take some time, so the earlier you let her know that you want to end things the better.
With your trip to Asia, being apart after your break up may actually help. It gives you a chance to think about how you feel and her a chance to adjust with knowing you are not nearby. It is very tempting when you experience a break up to be close to the other person just so the pain isn’t so bad. Couples who break up often see each other many times right afterwards because of this. By being apart, you may have more time to adjust to the idea of being separated so when you do see each other, it may be easier on you both.
And only seeing her for the evenings this upcoming weekend is also a factor. Since you know you want the relationship to end soon, seeing her is only going to be for her and not for you. It may help you both process the end of the relationship, but otherwise it only prolongs your decision.
Of course, a lot of what you decide has to do with how you feel and how you think she may react. If she tends to be upset easily, it may be better to wait. But if you feel it may go smoothly, earlier is better.
Here is a resource that may help you:http://www.helpguide.org/mental/coping_divorce_relationship_breakup.htm
I hope this has helped you,