Can i file jointly with my boyfriend since we live together but arent married

[VolvoGirl]

No.  You have to be married.   You a each file as Single unless you have a child and qualify as Head of Household.   

[DoninGA]

NO.  If you are not legally married then you can only file as Single or if eligible Head of Household.

See this TurboTax support FAQ for Head of Household - https://ttlc.intuit.com/community/family/help/do-i-qualify-for-head-of-household/00/25539