Did you end up going to that party? What happened?
Yes, understanding their attachment style can help when/if you both reconnect after a period of time. And yes, avoidant attachment people do come back. But sadly, it doesn’t always lead to a relationship because in a lot of situations, it requires them to face their demons and work on themselves.
There’s another forum member who is also hoping for their avoidant partner to come back, I answered his post with some stories of reconciliation. You can read their post over here.
Maybe speaking to someone who is going through something similar will do both of you some good.