I though about this alot and we had a talk and we are goin to try to be freinds. Is this a good idea? She is my best friend.
Salaam alaykum bro,
Firstly, congratulations on becoming a Muslim, and welcome as well! Masha'Allah, may Allah continue to keep you moving towards what pleases Him and brings you closer to Him
You're in a difficult situation - you know that what you're doing - dating and socializing with this girl who is also now a Muslim, alhamdullillaah - is something wrong. At the same time, you've had a very lengthy relationship with this woman.
Human beings are not perfect, and it is difficult to toss away a relationship that has lasted for 11 years, and that's understandable. Likewise, it's understood that not everyone is perfect, and everyone is at their own level of faith and practice in worshipping Allah subhaana wa ta'aala.
So, to be clear, it would not be correct for you to hang out with and socialize with this Muslim sister. It would be wrong. But, it may be difficult for you to pull away from this right away.
I could give you a very ideal answer - keep away from her. If you could do that, that would be awesome. But you may not be strong enough for that, so what I would advise you to do is first and foremost, acknowledge to yourself that dating, or even socializing with women as friends (I'm talking non-relatives here) is not allowed. When you acknowledge this, then you can ask Allah to forgive you, who loves that when you make a mistake, that you ask Him sincerely from the bottom of your heart to forgive you for this wrong you're doing.
Of course, when you ask for forgiveness from Allah, you should intend with your heart not to return back to the wrong action, but if you do, or you find yourself weak, then again repent, and keep repenting, and asking for help. And know that Allah will NEVER get tired of forgiving you, so long as you are sincerely repenting and trying to be a better human being.
Lastly, if you can't break away all at once, then take baby steps away, and make progress each day or week, or month. For example, before you were dating and had a physical relationship. Now you're talking about just staying friends. Maybe you can try limiting the frequency with which you socialize with her, from once a day, to once a week, to once a month, and so on, while asking for forgiveness until you are completely away from her.
May Allah subhaana wa ta'aala give you what is best for your difficult situation, and may He make it easy on you.