I dont know what to do

have been going the gym a lot and this lad that works there keeps stare at me and then the other day he asked me 4 his number. I go the gym everyday and when it was his day off he went the gym just 2 see me . When he is at work when he gets a break he comes 2 the gym 2 talk 2 me. I have got of with him loads and we are going the cinema on monday I really like him and he turned around and said he loved me . But my exs best mate keeps asking me questions like what are you watchin what time are you going the cinema :S.(its ever since he found out that someone fancyed me) I feel like my ex will turn up and ruin it 4 me. I feel like I am over him but I am not sure. I feel like he is gettin his mate 2 ask me all these questions 2 find out who I fancy. Me and my ex spilt up on bad terms and he spilt up with me. his mate sent me a link 2 the first film me and my ex watched and it was the first film we watched I feel like he is trying 2 get back at me or with me I am just not sure. I have not heard from my ex 4 ages but I feel like he is gettin his mate 2 ask me questions because when he talks 2 me on msn it doesn’t sound like his mate it sounds like my ex. please would someone help me what is my ex trying 2 do :S