should I ...

My friend and I have been friends for over year and just recently we have started sexting and everything's good like I'm starting to really like him (I did before but I had close those feelings off coz he's my cousins ex and I really hate that this guy and I have become this close) and I kinda wanna tell him that I've been fantasising over him coz he always says to me how he thinks about all day and I just don't know if it calm for me to tell him how much I think of him like will it scare him off or what 
Please don't start judging some of you can be really harsh 😅 I just need some advice on what to do for now and I'll worry about what might happen in the future 
Thanks x