Choking me while having sex??

**Update**—First off, THANK YOU so much everyone for your comments, advice and suggestions. We had a good talk. Like some of you said, he assumed I liked it. He said that when he was just in the moment and he thought I’d like it and when I didn’t say anything he thought I was enjoying it and wanted it more. I told him I like it but just not so long and hard and that it kinda freaked me out honestly, especially because we had never talked about it. We communicate very well during sex about what we want and like but this was just something he hadn’t talked about before so it freaked me out and that’s why I was concerned and reached out to all of you! Again thank you so much!! And I’ll continue to take your advice and suggestions to be wary...if he continues doing it hard and what I told him I don’t like...then I’m out. That’s not ok.

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Should I be concerned or is it just his thing? A little context...I’m in a new relationship. We waited a while before we had sex. He’s such a sweet and tender guy but the first time we had sex he put his hand around my throat like he was trying to choke me. I thought maybe this was just a kinky thing with him. Maybe he likes things a little rough but it wasn’t really even an extra rough passionate moment—we were getting there. He kissed me hard and then grabbed my neck with one hand...not long or hard but definitely squeezed my throat. He didn’t do anything like that the next few times we were together. Then this last time though when things were much more heated he did it like two or three three times. He only did it with one hand but squeezed a lot longer and tighter—like to where I almost couldn’t breathe and was moving to pull his hand off. Is this something I should be concerned about or is this just a thing he does and likes it?? The first time was ok but this last time when it was longer and harder...didn’t really scare me per se but maybe it did a little or made me concerned at least. I mean he’s not violent or anything otherwise...very nice, tender, etc. I know I should just ask him or talk to him about it and also communicate with him that I don’t like it as much as he does or just not so long and hard but if it’s something I need to be concerned about and should get out then I need to do that. Just wanted some help or opinions??