Paranoia and possessiveness getting in the way.

Hey! So I’ve had three really great dates with this guy and have a fourth planned in for next week. We haven’t spoke about who else we both may or may not be seeing and that’s where the problem starts for me. I’ve seen a few different topics on this and I know it’s not just me that feels this way but I am REALLY put off by the fact that he likes soooo many different girls pictures on other forms of social media. Seriously, it’s constant. And it makes me ridiculously paranoid that he’s talking to all these other girls as well as me so much so that I’m considering cancelling our next date over it. He was lovely when we went out and said each time at the end of the evenings that he wants to see me again and communication has been consistent and great tbh. On our last date I took my phone out briefly and saw him looking to see if I had any messenger notifications (I did but he didn’t ask who it was from) and later he took his phone out also (his mum’s been ill lately so he checks in with her) and opened messenger in front of me and didn’t try to hide his phone, he even handed it to me a few times to show me some pictures! It’s just the liking of all these pictures and the thought that he’s talking to these girls that is making me wonder if it’s worth seeing him again. Am I being too harsh too soon? Or should he have a bit more respect towards me and stop liking all these provocative pictures?