is this possible?

Sure you can be friends. It might take some time but it's certainly reasonable to spend time with someone whose company you enjoy or hang out as part of the same crowd without any bad feelings or thinking about what might have been or what used to be.

Try to think of relationships falling into one of three buckets: Casual, Close or Negative. There might be smaller groups within each bucket but most relationships can be thought of as falling into those with whom you are comfortable, those who you are close to, and those who make your skin crawl. I'm not including people that you barely know or don't know at all because you don't really have a relationship with them. Your Ex used to be in the Close bucket and now she's in the Negative bucket, even though you still have feelings for her. She's trying to say she wants you in her casual bucket - someone who she can enjoy being with as part of a group or even one-on-one. She doesn't want your relationship to be Negative, but she realises the two of you mixed like oil and water when you tried to be Close. She still has feelings for you too and she doesn't want you out of her life altogether and she doesn't want to fight with you.

It might take some time, but I think you and your ex could become good friends some day. She's sending out an olive branch, go ahead and take it.

i cant tho...its gonna turn bad, i tried it already and it was like after a few weeks i wanted to take her out and we really cant have that, it causes issues and tension

screw being friends. you won't get over her unless you cut all ties off. fvck friends. I hate it when girls say "just be friends."

This could be one of those Men are from Mars, Women are from Venus things...

I think when relationships are based at least partly on agreements of interests and points of view as well as sexual attraction and tenderness, then if and when difficulties kill off the romance, then there is some room for being friends later on. Sometimes way later on, and not so usually right away.

True. In fact, when there is tenderness alone, it is possible to remain friends. I think that is the key.

Not only will you be miserable pretending to be JUST her "friend", but you will have to watch her dating and seeing other guys and it will also destroy any future GOOD relationships that you have.
Keep your good memories of what you two had and move on with your life without her in it at all.