First of all, according to your description, we can see that the girl you like is a conservative girl, and she also said that she thinks you are more handsome and honest, so she got closer and closer to you later, but as they spent more and more time together, you became colder and colder, but she made it clear that she didn't want to have any further relationship with you, that is to say, she was not particularly relieved of your words, in other words, she didn't love you enough.

And if you make an overstepping behavior after making an agreement with her, she will naturally feel more uneasy about you, think that you are not as honest as she thought before, and will naturally alienate you and keep a distance from you. At this time, you should let her calm down for a while, but not too long, and then sincerely apologize to her, saying that you liked her so much that night that you couldn't help acting like that. Then show her that she will be responsible for her, work harder and buy a house with her. She should forgive you.

However, I think you realized from the first year of high school that you graduated from college, and now that you are both working, you can actually take a step closer. What you need to do is to give her a sense of security before she gives herself to you.