id like to add my boyfriend to my house deed which still has a mortgage using joint tenancy with survivorship can this be done

Yes, this can be done, but the more important question to answer is "should it be done?" You might consider:   How much equity is in the house? How strong is your relationship with your boyfriend? Do you intend to get married? Do you have joint debts with him now or might you incur joint debts in the future? Do you intend to give him outright ownership of one half of the equity with no payment by him to you? What are your intentions with regard to the property if you break up? Do you each have a will or a power of attorney?   There are more issues and you should consult with a lawyer versed in real estate, family law, and estate planning before changing title.