Proofs of Relationship for Fiancee Visa Application

I am here in Belgium with permanent resident status due to a relationship that developed while I lived in North America and he is Belgian.  We had to provide proof of when and how we first met, evidence that we had regular contact for at least 2 years such as chats, emails, texts, phone calls, etc.  We had to provide proof that we had spent a certain number of days together (I believe it was 45 days over several different visits but double check) so we provided plane tickets, hotel receipts, etc.  We provided pictures of us together from our visits and of our children playing together and family trips we had taken.  I was already here in Belgium and was given temporary status as they reviewed my application which took approximately 5 months.  In the end, it was granted without any issues.  Now 2.5 years have passed and we have added another child to our family.  We are getting married and life is good.  Good luck.