Healthy relationship will make you and your partner happy
Don't yell at them. Instead, fix their mistakes.
Yelling at them will not make anything better. Why don't you let them fix their mistake? They have know their mistakes and they will fix it if they love you. If not, I'm sorry.
Don't lie to them. If you lie, one day, it will makes things worst than you think. Your partner will find out the lies. If you lie once, it could lead to others lies. This will make your partner lost trust on you.