Tbh it's been a couple years since I've properly "followed" Suzi and I don't know anything about Ryan, so I could be off-base...
But her fiance is soooo not the type of guy I would've pictured her with! I pictured her going for a gym rat, a finance bro, etc. I'm surprised Ryan is even into her because he seems so (apart from the awful hair) unostentatious, whereas being an influencer is like the opposite of that.
I'm speculating, but it seems like they just kind of clung on to each other at the start of Covid because they didn't want to be single, and then by default they just stayed together.