Husband (31m) got drunk and got a tattoo of Biden peeing on Trump in "celebration." Can this be my final straw? We agreed in therapy to "big moves" for 6 months.

So husband and I have had our issues. We were great at dating, fucking awesome planning a wedding and on the honeymoon but it was like the second reality hit, things started downhill. We've been married 2 years now.
I have wanted to call it quits for about a year. I'm just not happy. I agreed to go to therapy with him and one of the first things the therapist did was agreed to a "contract" where we do no big moves for 6 months. That started about a month ago.
My husband has a history of doing utterly stupid shit like this and it's why I just can't see myself growing with him. We were both very happy that Biden seems to have won today but whereas I wanted to have a rational discussion about how Biden has a rough path ahead, my husband just wanted to party. He texted some friends and before I knew it he had joined mostly maskless drunken party that was happening in our city's downtown.
He came home with a tattoo on his shoulder of Biden peeing on Trump in the style of that Calvin thing that you see on trucks. It's not obnoxiously huge, it's just black lines and I assume it could be removed but it just is so stupid and I'm utterly grossed out by it.
In addition to everything else that we deal with together, can I violate our "contract" and just go file for divorce on Monday? Can anyone else who's been through therapy like this maybe offer some advice?