how to grow relationship

Start off with honesty
If you want to build a true relationship then start off with honesty. If you are not honest from the beginning then how could you expect your partner to trust you? There should always be some level of dishonesty involved in any relationship especially if you're going to be spending a lot of time together and are trying to build something special.
Be direct
Be direct and tell them what you think about their attitude, actions, etc. Let them know what they did wrong and how it affected you. Don't let things go unanswered; answer questions honestly and directly. You'll find that your partner will respect you more for being straight forward.
Be supportive
You have to be willing to be supportive at times. Sometimes your partner may need you to step back and give them space. Being supportive means letting them know that you understand where he's coming from and won't judge him.
Respect each others boundaries
Respecting your partners boundaries helps you both keep your sanity. Even though you might be upset, don't push it further than it already is. If you do, you risk pushing your partner away even more.
Always communicate
Communication is key when building a great relationship. Communicate regularly so you get to know your partner on a deeper level. This will help strengthen your bond and make sure you're on the same page.
Don't share everything
Don't share everything right away. Share only those things that are important to you and that you feel would benefit your partner. Sharing everything doesn't take anything away from you, rather it makes you look weak and shows that you're insecure.
Keep yourself open
Openness is the best way to create a strong bond between you two. Openness also builds trust between you and your partner. When you're open, your partner knows that you trust them enough to discuss anything without judgement.