YOU SAID:
Hello everyone mark is my boyfriend and he will forever be mine
INTO JAPANESE
こんにちは皆マークは私のボーイフレンドで、彼は永遠に私のものになります
BACK INTO ENGLISH
Hello everyone Mark is my boyfriend, he will be mine forever
INTO JAPANESE
こんにちは皆マークは私のボーイフレンドです、彼は永遠に私のものになります
BACK INTO ENGLISH
Hello everyone Mark is my boyfriend, he will be mine forever
That didn't even make that much sense in English.