should I tell him how I feel?

Now basically I have been talking to this one guy a month before summer started and when we chilled for the first time I had an amazing time so I kept chilling with him during the summer eventually we ended up having sex and he thought I was a virgin but before and after we had sex I am having sex with other guys but the thing is when I have sex with the other guys it is just sex but when I have sex with him I feel different I feel like I have feelings for him but I'm just scared he doesn't want me also he thinks he's the only guy I have ever had sex with what should I do