How do I make things good again without smothering him?

My boyfriend and I have been together a year. We spend a lot of time together, practically 24/7 outside of work. I've been very emotional lately, having crying spells and getting mad at him every couple of weeks, which I know is bad. I suggested that we start hanging out apart every now and then because it wasn't good that we spend so much time together, to which he agreed. I've noticed that he's been less affectionate the last few week. He also looks like he's zoned out when I'm talking and actually looks a little unhappy. The latest though is that he's starting to dress a little differently too. I was hoping that him hanging out with his friends without me would help us so we can miss each other and hopefully bring the passion back. Is this a bad idea considering how I've been behaving lately and he's probably a little turned off from my crying considering his recent behavior? How can I fix things without smothering him too much?
How do I make things good again without smothering him?
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