Where’s the line? How spiritually mature does someone need to be before you date them? What should a Christian compromise on and what should they require?

Where’s the line? How spiritually mature does someone need to be before you date them? What should a Christian compromise on and what should they require?
Any good Christian will answer “Of course”! By trying to be a “good person,” we automatically think we are trustworthy. However, there are many small actions that we take that can put barriers in our relationships.
Just because he’s handsome and goes to church doesn’t mean he’s the man of God sent by his angels to make you happy. We must be wise in our decisions and for that, it is necessary to ask real questions.
The woman is discouraged. The man she is dating seems to put his best friend before her. However, the man says he is really in love with her. Should she give him an ultimatum: “Me or your friend?”
We sometimes hear singles talk about their past relationships saying, “She was wonderful, but there was no chemistry between us”. What is this “chemistry” and do we really have to rely on it when we are Christian?