Sometimes the desire to please the person we like makes us pretend to be someone we are not.
Although I don't consider showing your best face to be a bad attitude, we must keep the balance or the girl will fall in love with someone fictional.
Do not lie or hide information
If the lies in a relationship start so early, it is likely that it will fail. Let her know about your mistakes. Show her your flaws and weaknesses. Be honest with what is happening around you.
Put on the table not only the good things , but also everything that could drive the other person away. If she stays, then she is willing to work out her problems to be with you, but if she leaves, you won't lose much, because she wasn't the one for you.
Make sure you spend money on it according to your real possibilities
If you accustom her to expensive and elegant gifts, even if you don't have a lot of money, you will have a horrible result. She will start being with you only in a selfish way, and once you don't have any more money, you will be thrown away. If you still don't agree with me, here's a fact: Good people will usually find a special walk in the park more valuable than a fancy outing they really can't afford.
Don't exaggerate about yourself
At some point in every relationship, all the secrets come out, and you don't want to come across as a liar, do you? It's embarrassing and can cause a loss of confidence from the other.