Am I just being Crazy?

4 years is actually a long time and usually after 3 years there come changes in life and intimacy in any relationship. But of course they need to be overcome and you 2 need to be open and honest about anything and everything. He could be stressed out and stress has a huge impact on life, but he could also feel less in love with you which is a regular occurrence after about 3 years (or even less). This is when real love needs to take over, and it requires maturity and patience.