I cheated on my girlfriend with my ex and she found out, what do I do?

I’ve been with my girlfriend for 15 months and about 3 months ago, I cheated with my ex.
My girlfriend found out but stayed with me because I told her it was a mistake and that I’m sorry, which is true, I wish it never happened.

A big fight broke out and friends of me, my ex and my girlfriend all got involved and my ex (who was a close friend also) told me we couldn’t be friends any more.
It bothered me at the start and I got over it but now I really miss her, as a friend, my girlfriend would never trust me again if she found out I was talking to her again…

What can I do? 🙁

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