Need advice please

I have been in a relationship for 3 years now, and it was going amazingly. However, a week or so ago I had a dream about my ex and since then I can’t stop thinking about them. I readded them on social media and they accepted, and now I am struggling because I don’t know what I want and I think it’s very unfair for my current relationship. This ex was a really good friend of mine for years and I definitely do miss being friends. I don’t know what to do. We never really had closure when we split either, so I’m thinking instead of wanting to be back together I just want to talk about it? I don’t want to start up drama where it’s unnecessary but it is eating away at me and I don’t know why. I want so badly to just forget it and move on, at least I think I do. Any thoughts?