Aaron and Andrew will address the issue ((against Andrew’s will)) in more than one of their joint sessions with Betsy – Aaron will bring it up again and again until Andrew finally has to respond to it. So yes, they will address it in time, whether or not Andrew wants to talk about it. ((as far as he is concerned he already talked about it when he promised to protect Aaron, never mind that he never explicitly said he’d murder Tilda if she laid a hand on Aaron))
Once Aaron understands the reasoning behind Tilda’s death, it’s a little easier for him to find closure – he’ll never be 100% okay with her death, but he’ll understand her murder was an act of .. love?, and he can work with that as much as he needs to
But yes, they’ll fight over Tilda v Cass, though that is a bitter and short-lived fight the first half-dozen times through. Cass never hurt Andrew & only wanted the best for him, whereas Tilda was an abusive wreck, so Andrew is loathe to see the comparison between their situations.
Aaron’s trial is probably the biggest eye opener, because the lawyer takes that conversation the absolute last place Andrew wanted it to go, to a conversation he intended to only have with Neil – that the unforgivable line with Drake was Aaron’s involvement – and that is the moment Aaron fully realizes & accepts that Andrew would burn the world for him
Aaron might never fully forgive Andrew for Tilda’s death, but there’s no going back from that kind of love