My girlfriend just gave me another chance after almost breaking up, how do I make her stay with me?

So me [14 M] and my girlfriend [16 F] are almost a year together but we have not been getting along very well lately. And this week we saw each other a couple of times, and I was not really happy and I kind off ruined all of those days for her. One day I told her that maybe we should break up because we were not getting along. I told her I did not mean any of that which is true.

But today we got into an argument online. She was with friends, it were all boys and one girl so I didn’t like that. So I told her to go fuck one of the boys out of anger and jealousy. She said something mean to me and then I said something even worse. She told everything to those friends and they were saying that she had to break up with me.

She started saying that she actually wanted to break up and that it was done between us. (She also said that I am toxic and that I mistreat her, and I know that I sometimes am not the best boyfriend, but I really want to be) But I really didnt want that to happen so I really begged her not to. And since we are going on vacation with my family for a week she said: we’ll see after the vacation. So my question is; how do I make her want our relationship again?

TL;DR,
My girlfriend was telling me its over because I have said really bad things to her, but she gave me another chance because we are going on vacation together. How do I make sure she wants to stay together after the vacation?