When you love someone truly, it's hard to forget about the love, you can't wake up the next morning feeling like you don't love him anymore, nevertheless, things change and it might come some time when you can't stay together anymore.
then staying friends will be an option, but here are some reasons why you shouldn't stay friends with an ex right away:
1- You probably still hurt:
When a relationship that is based on so much love comes to an end, it often ends up with so many painful memories, since love can bring too much extreme feelings, where love is concern, we often can't seem to act reasonably, therefore, being in each other's life can be an unnecessary reminder of all the hurt and pain you've been through.
2- You'll feel bad about yourself:
When I came to break up, I felt extremely stupid, stupid in love, for all the nonsense I let slid by, for all the lies I believed, and all the broken promises and excuses I tolerated and having him in my life as a friend would only make me feel even bad about myself, the least I could do then was to keep a distant, at least that would make me feel like I've done the right thing for myself esteem.
3- You need a distance if you want to forget:
No one can get over a relationship that is based on true love in no time, it's not like you can convince yourself, decided and move on, you'll need some time. Scientifically we need more than three months to move on after a breakup, you'll need a distance as well, and while you're forgetting and healing, you shouldn't keep in touch with your ex unless you want to keep loving him!
4- Using the excuse of sorting things out is useless:
When you breakup you might be left feeling confused, trying to understand the reasons for which you both had to come to this point, where is all the love and dreams you used to share. Talking further with him might sound like a good solution, but it often wouldn't get you anything but more arguing and pain, sometimes you don't have to understand everything, somethings are best accepted as they are, just keep in mind that it's not just his fault, you have a share too.
5- it might feel weird:
The one you used to call love, each time you try to call his name, it won't come out right, making you feel this weirdness. The thought of all the intimate moments you shared with him and now you'll have to look at him as a friend!
You still can stay friends with him, after all, it's always better to bring peace into your life, forgive and forget than to hold grudges, just make sure you take your time and move on fully then, a simple hi and a small conversation will be fine.