Should I be concerned about this weirdness after sex or am I just reading into it too much?

[Lotsgoingon]

So I've advised letting him go ...

But you also had a role in this in neglecting yourself-- and here it is.

He was really focused on my pleasure which was nice, but I can’t orgasm without a strong emotional connection. I’m not there yet with him.

This was your own red flag that signaled you were not ready to have sex with this guy. Seriously, if you're not feeling a connection, it's better to stop in the middle of the act rather than fake it and keep going. Faking it NEVER helps, never creates bonding, never creates intimacy. By faking it I mean you have sex when you really are not feeling emotionally there yet. It never works. Only produces disaster.

Assuming you want to orgasm, you've got your rule. Only have sex when you are 100 percent confident of this emotional bond. Otherwise, no. 

[ExpatInItaly]

He's embarrassed, OP. 

Even though it might not be a big deal to you, it seems he feels quite ashamed that he came quickly and couldn't manage to bring you to orgasm. You have a perfectly valid reason for not getting there but he's tied up too much of his value in his perceived lack of prowess. 

I wouldn't reach out again. You have already tossed the ball into his court with your last message, so it's up to him now to toss it back. 

[Marka]

Has he reached out, OP?

Had the similar situation in the past. It is usually sign of immaturity and having deep issues. Better to let him go...