No, as long as you are not on the deeds of her house. Your future borrowing capacity will however be limited by her mortgage as you are legally required to step in if she doesn't make the repayments for any reason.
Can someone clarify this for me please? If 2 people get a mortgage, doesn't that then mean that they are both FTBs, regardless of whose name the property ends up in ?
therefore when they go back for a second house, they'll both be on the mortgage so be 2nd time buyers ?