Relationship troubles

Hi. My name is Ella and I'm 17. I was wondering is anyone could help me. There is this lad who I really like and may even love but I'm too scared to tell him coz his mother is my grandfathers girlfriend. I've been told to stay away from him as they all think he's bad for me. But because of how we feel for each other we can't stay away. And we have tried staying away from each other but it made us miss each other so much. I have begun to lose all hope of been with him. Please can someone help. Thanks xxxx