There’s a balance between holding back too much and giving too little. For a follower of Jesus, I find that balance through staying close to Jesus so you can hear what He says– yes, go deeper, trust more, respect, love more.
It’s going somewhat slowly so that as far as you know, you’re not leading the person on, and you’re able to build a healthy, solid attachment with the real person.
If you go too fast, then you can get caught up in the emotion and not feel your true emotions or aren’t willing to look at the warning signs. You want to get to know the real person, not just who you think they are, and that takes time.
Guarding your heart means not letting the person become an idol or obsession. As you grow closer to them, they should become more important to you, and you invest more into them. However, you want a balanced investment.
So if both people are aware of what’s going on, the attraction and affection that is growing, the trust that is deepening, then they can carefully respect and interact with the other person in a caring, honest way until they know for sure if they are to move on to someone else or be together for life.