I recently started dating someone and we hung out. My ex, (daughter's dad) calls me all the time, sometimes 60 times in a few hours. If I don't pick up the phone, he comes to my house. Today myself, my date and my daughter went for lunch and to the park. My ex kept calling and eventually I picked up the phone because he wouldn't leave me alone. I told him we'd gone to the pub and the park but didn't say we were with the guy I was dating. My ex was suspicious so he drove to my house, saw I wasn't there and then saw me driving home on the road outside my house. He then followed me down the street. I had to stop. He opened the car door and called my date a prick and said he wanted to take his daughter and took her. My date was very upset and so was I. He said he needed time to process this, says it's my fault and is calling me a liar... What should I do?