Okay, so you had a really messy break up.
Both you and your ex said some really awful things to each other that caused a lot of pain and resentment to you both.
Now for you to make your ex fall for you again, you need to show your ex that you accept that you caused him/her pain and anger, and that you are willing to do whatever it takes to fix this.
Obviously your ex also made you feel bad, but just let your ex know that you are aware of your own faults and not his/hers.
In other words, be very mature about things and do what you have to do to fix the problems that you have caused that contributed to your relationship coming to an end.
The chances are that your ex will realize what a great person you are, and this will probably make your ex fall for you again.
Now there is no way that you and your ex can get together to talk things over right now - the atmosphere is still too tense between you.
However, when you are with your mutual friends, there is plenty that you can do to let your ex know how you feel.
There is no doubt that what you say to them will get back to your ex and, because you are not having any contact with your ex, he/she will gradually have a change of attitude towards you.
Tell your friends that you feel so bad about hurting your ex so much.
Say too that you want to do whatever it takes to convince your ex that you did not mean those things that you said.
Don't even mention that your ex also said bad things to you - he/she will realize this by him/herself.
Remember, the whole point of this is to make your ex fall for you again.
Being understanding, and giving your ex the space he/she needs to thing things over will prove two things.
One, that you are a mature person, and two, that you love him/her so much that you are willing to wait - however long it takes.
Given time, these qualities in you will make your ex fall for you again, in a big way.