how can i stop thinking about our memories together?

You just have to think about the present and not what you two had but focus on what you will have with a new person.

I believe you'll always have moments when you think about memories with someone else, in different ways. So stopping it completely is rather impossible but also not needed, I think. It is more in the sense of how you deal with it and process it as well as accept it. With time these will also be more manageable and you'll learn from it as well. As long as you can move on and create new memories you will be okay. The way you look at memories and react to them will change over time.

Make new memories ,memories are not something that can be forgotten just overcome don't dwell what's in the past and live the present

You honestly don't. I've been in many situations where it feels like you can't get over one person or you can't stop thinking about them. It depends on whether they still hold an important role in your life, or are even apart of it at all. It takes a lot of time to be able to completely stop thinking or obsessing over someone and their history and past events with you, especially if they were really important in your life before. Sometimes you just have to know when to let go, but first, you have to figure out if you really want to since you're still thinking about times you shared together.

Accept the fact that your time together is over and move on. Give yourself time . Get a hobby . Go out with your friends. There is a lot to be explored.

by doing things you love. Work on your passions by setting goals and achieving them. the memories will fade slowly.

By making yourself busy. Grab something that you can work to keep your mind off of him or her.......

this is something that cant really be answered ...you can always distract yourself to keep yourself from thinking about it but it is something you will always rememeber

If you have anything around you that reminds you of your ex, get rid of it, or put it away. Surround yourself and your environment with other things, old and new, that make you happy.

I don't think you should stop thinking about them. They're memories and they are part of who you are. cherish the good ones, and let go of the bad ones. but if you do want to stop thinking about them - keep yourself busy. make yourself a busy schedule, and as soon as you start thinking about any of those memories, remind yourself to focus on what it is you are doing right now, for example studying, working out,...