help?

So I have a guy who I hook up with occasionally. We don’t talk except once and a while outside of that. Last night we smoked in my car and hooked up. I hadn’t had sex in forever so I was ready to go. I ended up coming basically as soon as he got in me. I’ve never actually had a full blown orgasm with him before and I know he felt it bc he said oh shit when it started. He told me to message him when I got home when I left but he hasn’t even opened my message yet from when I messaged him. I’m just wondering is that a big deal that I came for the first time? He normally at least talks to me a little the next day. Does that freak guys out like we’re getting too comfortable or something? I’m just overstressing I think. 
What do you guys think?