There are typically three main areas to address in a divorce:
Child Custody & Support - Without kids, this does not apply.
Spousal Support/Alimony - Although he hasn't mentioned their income levels, seems unlikely to be a factor due to the short duration of the marriage.
Assets - Some US states are "Equal Distribution" meaning you split everything 50/50, but the majority are "Equitable Distribution" in which you take off the top any assets you can prove you had coming in then split anything you accrued during the marriage 50/50.
Again, I don't know Joshua's income or assets but get the sense based on ages and lack of him discussion money that his D should be fairly straightforward and there's not a whole lot of negotiation or reason to fight, so a quick and simple D probably makes the most sense. However, I would certainly agree w/others it doesn't hurt to review things with an L before filing just in case - you don't have to "lawyer up and fight in court" but a review just to be sure there isn't anything glaring never hurts.
Joshua - I'm completely with you on taking marriage vows seriously and being against divorce, unfortunately for us it takes both parties to commit to that and is impossible to hold to that with only one of the two of you. Make sure you're focusing on making your own life awesome. Hit the gym, get involved in fun activities, meet new friends...etc. and you'll have a great life in front of you.
Me:39 Ex-W:37 M:7 T: 9 S:6 D:3 BD/IHS/Confirm EA/PA: Feb '20 OM1 affair ends: May '20 W/OM2 & moves out: June-July '20 W files for D: Jul20 OM2 confirmed: 9/2020 Divorced: May '21