Vast Forex thru MT5, is this scam?

This platform was introduced to me by my boyfriend. My 1st deposit was $196 w/c earned and became $221.3 I withdraw $121 and it was okay. I then withdraw the balance $100 but did not went thru, CS said I need to top up the account with the equivalent. I did another deposit of $289, $593, and $9003.98 w/c came from my bf to earn more. But now I am unable to withdraw all the money $11547 and asked me to pay taxes but still unable to withdraw. please help me get back the money