Needing advice

I have been having sex with this guy for a month or 2 and at the start we both agreed we don't want anything serious at the moment but as times gone on sleeping with and talking to this person almost everyday I have devolved feeling for him, I don't no weather to talk to him about it or just wait and see where it goes. I really don't want to scare him off as he is completely different to anyone Iv ever been with he has all the qualities I want in a man. 😫😫