So my boyfriend and I have been living together for one year now. He has two daughters..one is 11 the other 13. The 13 year old is the one that is breaking my heart. We have the girls every other weekend and two evenings during the week. Some days she is fine, talkative and friendly. Other days she'll cry and throw fits, has even refused to come since I'm here. She has been destructive dumping my shampoo down the drain, putting wet towels under the covers on my side of the bed and flat out told her dad she wishes I would just go away.