As much as you may want to convince him to change his mind, this will only cause embarrassment. Avoid arguing with him or trying to get him to see what he's missing out on.  For example, say "I'm sad that you're not interested, but I understand and respect your decision." Additionally, this will show him that you're mature and self-sufficient. You may feel dumb for asking him in the first place. You may feel devastated because you really thought he was the one for you. You may be angry at him (maybe he led you on) and need some space. All of these reactions are okay. Give yourself permission to feel whatever pops up in your body after the rejection. Avoid suppressing your emotions for his sake or because you feel like you should feel something else. You can't control how you feel, but the best way to move on from these feelings is to give them space and let them pass. Acknowledging your feelings doesn't mean you have to accept them as true. For example, you can acknowledge that you feel stupid in the moment without thinking that you're actually stupid in reality. If you are friends with the guy, you may be worried about things being awkward between you after the rejection. This doesn't have to be the case, especially if you have a close friendship with the guy. You may want to let him know your intentions so he can feel safe rather than pressured in his decision. Here are some things you can say to let him know how you're feeling:  "I hope we can still be friends even though you don't want something more." "I need some time, but after that would you like to hang out as friends?" "I don't want it to be awkward between us. I'd still like to be friends. How about you?" If you're really sad about the rejection, don't force yourself to stick around. Make an excuse for needing to leave. You can go home and handle your emotions there, or call a girlfriend to talk with. Whatever you do, avoid using him as a shoulder to cry on, because he will be in too awkward a position to comfort you. If you're really nervous, you...

How would you rephrase that briefly using Vietnamese?
Chấp nhận quyết định của anh ấy. Thừa nhận cảm xúc của bạn. Khôi phục tình bạn. Tạo ra một lối thoát. Thành thật và chân thành.