first of all: hymens can be broken due to things other than sexual intercourse (like horseriding, gymnastics, masturbation etc)
(google hymen if u dont know what im talking abt, its the skin that means bleeding (sometimes) when u "lose ur virginity")
second of all: like many other posters here have said, it means that ur gf was aroused (which is a Good Thing). shaming ppl with vaginas for being "loose" is really rapey, because it means that they aren't into it. so get over urself, anyone w that pov