My boyfriend took the initiative to transfer money to me and joked me twice to pay back the money. I immediately transferred the rest of the money to him, and I was really unhappy.

Your boyfriend may be really joking with you, or he won't lie to you. Now that you are engaged, is your boyfriend treating you well? If he can't do it, then you shouldn't be engaged to him! As a woman, I understand how you feel. Sometimes we are really angry, but in their hearts, they really don't realize that we will be angry. So since they think this kind of thing can't be joked, make it clear to him and ask him not to joke about it in the future. Most men are careless, don't care too much. Now that they are engaged, everything is laid out. Besides, didn't your boyfriend already apologize to you? Just forgive him this time and let him know his mistake and correct it!