I use an iPhone and my fiancé uses Android. He is not very tech savvy. He does not like to text for privacy reasons. I was going to recommend we get Signal but see others in Lemmy talking about Matrix. Is that better? If so, what app is best that works on both our phones? Thanks Lemmy friends!
You would need to host your own or join a matrix server. The benefit of Matrix is you can tie in puppets to things like iMessage, Discord, FB Messenger if you host it yourself. Another option is Beeper (Matrix + all the puppets for other messaging apps) but you still have to sign up and get an invite from them to join for now.