Hello sir/ma'am...i am a girl of 21 yrs and my bf 24yrs.We met each other through an online friendly chat app.Since 1yr,we r chatting,video and voice calls.He told me,he loves me and wanna marry me.I too liked him and I took the matter to my parents and they agreed for our marriage also.I made him talk to my parents.He didn't still let this matter know to his parents.Recently,without my permission..my cousin sis took his insta id and chatted with him like an unknown girl for fun.She created an account in insta and sent a request to him n he accepted that request and continued chatting with her.She told him like she saw his profile and interested and so given a request.He was asking her for voice call,video call,but she didn't accept.She sent some other picture when he insisted her pic and later he asked her "do u like me" for which she funnily replied love at first sight and love you.He told her he want to express his love to her in voice call and later he too proposed..she showed all those screen shots to me. I am broken.I questioned him what is all this?...for which he replied...he just chatted to find out whether that account was a fake account or real account...but,the screen shots were showing something different..when my cousin called him bro..he was very upset and scolded her too. Now,he saying he thought it's a fake boy id and wanted to make fun of and even fought with me saying i don't trust him and without his acceptance..i gave his id to my cousin..but,i havent given.. He is saying he wanted to test whether it is a fake or a real account and so he made fun off and didn't mean it and that too just chatting it is n not to take it seriously and he loves me much.. I am confused after this whether to proceed for marriage..he isthe first guy and love in my life...should i believe him or let him go or should i give him one more chance?..please give u r advice..thank you