Oscar dated Jet McAlister for about two years, and then broke up about a month before her Mom's stroke.  They stayed friends. In Rock Chick Rescue, he makes a scene at Fortnum's and confronts Eddie Chavez when he hears that Eddie thinks Jet is a racist. 


"Oscar was about two inches taller than me, had warm, brown eyes, fantastic, thick, dark hair and some acne scars which, lucky for him, only served to make him look more interesting." - Ashley, Kristen (2011-03-04). Rock Chick Rescue (Kindle Locations 1148-1150). 
"Oscar had a short fuse which, upset, could quickly grow into something much harder to control." - Ashley, Kristen (2011-03-04). Rock Chick Rescue (Kindle Location 1152).