Would or Do any of you all with young children shop for christmas trees with your ex?

My ex texted me tonight about going to get a tree this week inviting me. (we both have seperate homes but are nice to one another for the most part).

We did this together last year but we were just seperated, this year we are divorced and she spilled the beans last week that she is seeing someone (46m / 34f).

I am conflicted. I want to on one hand for the kids but also don't want to on another. Is there some underlying motive to this?