If you want to open your partner’s heart, you need to be sincerely interested in your partner.
For example, some men are brave enough to approach her. But then have no idea about what to talk next. Maybe he starts talking about recent news. If he is a businessman, he might talk about economics.
But no way. Dating is not a place to show how good he is. It is a place to understand her. And this is the real intelligence.
For women it is the same. A man also want you to be interested in him. Try to understand what he likes, his value etc.
Maybe if you show your interest toward him, he opens up his heart and he will do the same.