Assalamu alaikum Wa Rahmatullah Wa barakatuh,

 

I am not trained in dream interpretation so cannot advise directly on this. You could take this to a learned scholar who can advise on this. What I can say is that Islamically, e know that dreams can come from 3 things; Shaytaan, Allah or your own random thoughts. In this case, given that you have been spending time with this girl it is quite likely that you would then go on and dream about her, for no other reason than you are spending time with her, but Allah knows best.

 

Sometimes people will desire to find meaning in their dreams, especially after having made istikhara, but it is important to be aware of how your daily experiences can also impact on the dreams you have and how you interpret them. When it comes to relationships you have to be cautious of your interpretations in case it causes you to do something haram. In your case, for example, it may be tempting to read into this as a  dream from Allah that is encouraging you to get married to this girl, when actually it could be Shaytaan encouraging you to stay in a relationship that is not meant to be, or just a completely random dream. Ultimately, be careful of how your current relationship with her and feelings towards her might be affecting your personal interpretations.

 

Either way, do be aware that having a relationship with a girl outside of marriage is not permissible in Islam and may be affecting your reflections of your dream and be encouraging you to continue with something in a way that is disliked by Allah. If you require further guidance on this matter then do make sure to seek guidance from a trusted scholar or imam.

 

May Allah guide you on the straight path and protect you from harm.