Trying to "be friends" can prolong the agony of a breakup. Most often, it is best to make a clean break and spend time apart. After a time, perhaps three months, perhaps a year or more, when you see one another, it won't hurt as much, and maybe then you can try to be friends with a clean slate. Even then, be sensitive and respectful about what your ex needs––they may need more time than you. If that's the case, don't just foist yourself on the ex in an attempt to become friends some time later.  If your ex asks "Can we still be friends?", say, "No, we can't still be friends. For now, though, I think it's best we just let things end." If pressed, say, "Look, we started out as friends and went past that. To be friends, we'd have to go back, and frankly, I don't want to go back. We need to go forward now. That means we need to put some space between our broken relationship and any new relationship we might form. Let's take a break, take some time, and give each other the space we need to heal and move on. At some later point, when we meet again, we might be able to put our anger aside and be friendly. Let's leave it at that." However, make this the last contact between you two. Make the break final with no further contact ever. If there are mutual friends that are shared by the both of you, inform them of the breakup and also inform them that you will not appear at any functions that your ex-lover will be present at and if that means they have to choose sides, so be it. Sure, you're the one who did the breaking up, but in most cases, that doesn't mean you want to have a night on the town to celebrate your new freedom. What people don't understand is that the person who did the breaking up is often in just as much pain as the person who was dumped. In some cases, the person who does the breaking up feels even more pain, because he may also be plagued with feelings of guilt, even if they knew it was the right thing to do.  After the break-up, take some time to yourself to re-evaluate your life and think about what...

How would you rephrase that briefly using Vietnamese?
Đừng cố gắng giữ mối quan hệ bạn bè ngay lập tức. Dành thời gian để giải quyết mất mát của bản thân. Tận hưởng cuộc sống sau khi chia tay.