Have u ever been so confused? please read this, i don't know ?

O.k. heres the thing i recently split up with my boyfriend daniel and since we broke up he never hangs round with me at school anymore and hardly talks to me but yesterday when i was chatting to my friends he ran his finger down my back, i turned round and he said he did it to see if my back arched cause when u do that sometimes i tdoes, then showed me on his best mate, i thought nothin of it but then after school today when i was waiting for the bus, i got this strange feeling that someone was watchin me, i turned round and my ex behind me, he was realy close and just sorta smiled and laughed, i turned back round and felt he was still behind me so i turned and he was just smiling and gigling again, i asked him what he was laughing at and what he was doing all together but he woudn't tell me, then today we had a fire drill and he was begind me in the line cos thats the way the register goes, he tapped me on the back to say hi and then when we got back inside, he waslked by and said bonjour, any ideas why hes talkin to me again?, why hes obsessed with my back?, i just need some help exsplaining his behaviour, thanks