My ex and I had a very amicable divorce. Sold the house split the funds. Equal custody of the kids. No alimony, no support. My ex has since been promoted at work several times and now makes significantly more than me. We haven't been sharing income info per our divorce agreement. If I need to get this information would it be best to just ask? We are on pretty good terms. Or do I involve a lawyer proactively?

Edit: we did the divorce without any lawyers involved