Well, if he knows what he is doing . . . if God is giving him vision for what he will be doing 5-8 years from now . . . and if you are a for-real lady of Jesus, appreciate having time to share with him so you see how a real man of God is and relates . . . so you can prepare to share your life with a man like this. And if he knows what he is doing, and you are a real Jesus lady, he can share with you so he is learning how to relate with a really Christian sister.
If you want a real guy in God's way of marriage, appreciate your time sharing with any one or more Christian brothers you have now. This way you can learn how to relate with a real one, and this can help you to not fall for someone who is not for real.
Even though I am not married, I learn how the real Jesus ladies are, and who is not how I understand God would want my wife to be . . . just in case I am still meant to discover who I belong with in marriage. I am learning my standard for how she should be . . . and how I need to become . . . so we don't accept less.
I think I am seeing how some number of married couples did not first establish their Biblical principles of how to relate in marriage. They perhaps just fell in selfishness with each other, instead of growing in God's love with one another. And now they can readily fall apart in fighting and bad tempered stuff.
Because . . . while maybe they have a moral principle not to commit adultery or kill each other . . . they do not have principles of how to be faithful to Jesus > they do have affairs with arguing and complaining and being unforgiving and bitter.
Instead > I think there are things of God's word to develop in now >
"the husband is head of the wife, as also Christ is head of the church" (in Ephesians 5:23)
Of course, ones right away on reading or hearing this can get into a tumult . . . because they are un-subject spirits. And this is why they can not submit to how Jesus gives us
"rest for your souls." (in Matthew 11:28-30) And I keep hearing from women who can not understand why they keep giving in to stress and workaholic stuff . . . while they insist they are not going to be slaves of their husbands > and yet they are slaves of their own stress and workaholic stuff and ongoing hurts.
And they don't even trust their own husbands, of all things!!
I would say you belong with a guy who is your head . . . someone you trust, not that you are a slave. My body is not a slave of my head . . . of course. Plus, my head can not make it without my body, wouldn't you agree?
And Jesus our head is our example of how to be and how to love >
"And walk in love, as Christ also has loved us and given Himself for us, an offering and a sacrifice to God for a sweet-smelling aroma." (Ephesians 5:2)
So, your man would be someone who feeds you this, I would consider. He is an example who helps you to grow in Jesus, including how Jesus has us submitting to God in His peace while sweetly pleasing Him and loving any and all people as ourselves . . . like Jesus did on the cross.
And I think you can see the advantage, then, of getting to know men like this, even if you don't marry one of them. And if you want this, you will be God's blessing to such brothers, to help them become more real with God . . . so may be they are ready for some other sister whom God is preparing for them, but you have helped them >
"It is more blessed to give than to receive" comes to mind > this is a quote of Jesus, in Acts 20:35.
Be appreciative, then, of any moment with any really Christian brother. And with each one you can develop in how to relate. And, by the way, he needs to get how to be really submissive, too, since he is expected to submit exactly to how God rules Him in God's own peace. So, your man you belong with is not really bossing you, but both of you are submitting to God, and God has you simultaneously submitting to however your husband guides you.
But there are un-subject people who are taking things into their own hands and being their own person. And the emotional havoc of that betrays how well that works!
Now, for someone who supposes holy matrimony is one-way slavery of a wife to her husband > how about how >
"the husband does not have power over his own body, but the wife does"? lolololololol
This is in 1 Corinthians 7:4. Oh, this is the "Singles" section, not "Christian Advice"; so we can have a little discussion here . . . if you want.
Oh, and to keep this on track with your question in the title of this thread > as you invest in how the Bible says to relate, this can help prepare you for marriage.
Plus, as God knows you are growing in this . . . as His child,
whom He knows how to take care of 
> He will have brothers and successful married couples showing up to help you along while you help them along. He is like a parent who can see how one's child is developing, and that parent brings along what the child is ready to deal with.
And, of course, the child will need to learn how to handle each thing; correction will be needed, and the parent's personal guiding.
So, I would say, invest in being able to be personally guided by God in His peace > Colossians 3:15, Proverbs 3:5-6 > so then you know how to be personally guided about each man you share with. And the ones not for real are being trusted to you, by God, so they can get your help and good example.
