How yo get back with an ex?

1 broke up with him when I was drunk back in September not really wanting to. So throughout this time I've been on dating apps looking and talking with new guys and I see him still on there every tine I restart my account. I would lije to introduce getting back together but I'm not sure how?
We had great chemistry I just made a mistake and I’m really never one to just come back
How yo get back with an ex?
Post Opinion