ex girlfriend wants to hang out, but has boyfriend

my ex girlfriend of roughly six years (all high school and some college on/off) wants me to come over and see her family on thanksgiving because we will both be back from college; just found out the other day she has a boyfriend and it really is hurting me a lot. should i play it off cool and go see her (say i'll be in the neighborhood) and act cool and unaffected. truth is i really care about her alot still (sucks i know). or just the no contact until she contacts me over the holiday break?

any advice would be great.