I need advice

So before I start, let me preface this by saying I have been happily married for 4 1/2 years and we have 2 kids ages 2 1/2 and 12 months. We went through a little rough patch after our second was born because I had PPD but we worked through it and we are doing better than ever now.

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So… I have been having dreams about my first boyfriend. VERY vivid dreams. I know it’s normal to have dreams like this sometimes but I’ve been having them like 2-3 times a week for several months. I’m not sure why I am dreaming about him so much and it’s really starting to bug me. We are still friends on social media but haven’t talked in years and I don’t think about him during the day often at all. It’s only in my dreams. I just want to know if there is a meaning behind it or something I can do to stop dreaming about him.