You must be past the honeymoon phase to be in a long-term relationship. Most relationships fail to pass this level.
A long-term relationship is where you have been through difficult situations together and have been there for one another.
if you people have been through a phase where you and your partner were spaced of drifting apart, but you guys bounced back.
if you have been in a long-term relationship, then you two must have started taking financial decisions together.
if you have passed the phase, where it is no longer awkward to meet each other’s parents, have you have bonded well with them, then you have been in a long-term relationship.