Congratulations on your magical wedding and beginning of new life together.
Your mother-in-law's actions reflect her own transition from when y'all were a boyfriend, girlfriend to the separation to renewing your relationship and taking making your vows.
Actions speak louder than words. And it may have been a very good thing that your boyfriend left to work out his demons and conflict with your relationship. Perhaps this happy union would be incomplete without that period.
Cheers and virtual champagne toasts for your marriage!