This☝🏽. Best evidence when immigrating is going to be primary evidence that showed you spent time in person. Lots of single photos with just the two of you, affidavits, social media, chats, etc., is considered secondary evidence and doesn’t carry much weight. That’s not to say don’t submit any but you will need to submit more primary than secondary. Photos together with family/friends are better. Tax documents aren’t really beneficial unless it’s showing co mingling of income. Continue to gather and submit evidence.