My boyfriend broke up with me, but now he's messing with my head :/ helpp!..?

i was with my boyfriend for 2 months, but then he broke up with me because he said he is still in love with his ex but she has gotta bf and been with him for 2 years.. but now we have broke up i sed will just be friends and that's all.. soo when we talk on msn he's all flitry and when i don't write back he gooes mad and he also trys sendin mee pictures of his body.. but if we decided just to be friends becos he still loves his ex .. why is hee beinng this way =/ .. eny adviceee ....??!