At the time you have raised this question related to relationship and long term as partner or likewise, indications are that relationship and partner lords are forming good relationship and in the house of question. That's a very good sign.
Only point of concern is that lord of question is not in connection with Love relationship and partner, but chances are good.
It will be better to have positive approach. This can be a good relationship
Hi,
I have a question in my mind.
I'm in a relationship with a girl.
Will this Relationship lasts till death do us apart in this lifetime ?
It does not look favorable to me.
Both you/Jup and her/Mer are weak in the matter by essential dignity, both in fall. They also do not aspect.
Rather she/Merc, in the your 12th house of hidden enemies, is retrograde, moving away to become combust the Sun.