Your probably horny b/c you haven't really been able to "be" w/ your girl the whole time you were together...and then like the other day she's all over you just out of the blue.. no wonder it's crazy LOL
Find a "normal" girl and try to have fun. lol
And no I think it's b/c it's been "over" for awhile now.... but now you are truly "free" to date who you want.