@bathsh3ba
It was a lot, but I'm used to it, so I'm noticing it's not there! Fine if it's normal, I haven't said anything to him about it!
Don't judge it by what's normal. For some people it's normal to text constantly throughout the day. For others it's normal to not hear from each other unless they've lost a limb.
Allow yourself time to get used to any changes in your relationships/see if they change back/see if a conversation arises naturally. If things carry on in the way you don't like, express this to your partner. If you don't feel comfortable to do this, that's a red flag in itself. If you tell your partner you're uncomfortable and they don't try to work it through with you to find a compromise, that's another red flag.
That's all you need to know about boundaries. You don't need to ask other people (in fact, it's pointless to, because they don't know what you feel or what your partner feels), you only need to ask yourself.
So, in this situation, you know he's really busy; let that settle down before you make any judgments. There's no rush. Look at how you feel when he's back to being not so busy. If you feel unsettled (for example, if you feel like posting on a forum), talk to him about it. If he's respectful, stay with him. If not, leave him.
You're dating. It's a vetting process. Work out whether you have gone off him because of the drop in contact, rather than trying to get an answer from a bunch of strangers about what's going on in his head. The answer to your question is 'We don't know, and you can't guess accurately either.'