new relationship advice

I've been in a relationship for 3 months but we had been talking for about a year. Whenever I am going to hangout with my friends I always tell my SO where I'm going to be at and who I'm with. I think it just shows them that I'm respecting them enough to tell them. We are always in contact throughout the day, even if I'm out with my friends I make it a point to text back. 
Lately whenever my SO goes out with their friends, I'm never told. I know something's up bc I won't get a text for a couple of hours. Like I said, we are ALWAYS in contact. Am I trippin for not being told or should I not think too much about it? I'm an overthinker about everything, so I wouldn't be surprised if you all think I'm crazy! 
I don't want to seem like a crazy, possessive woman and I would never be upset that they're out. I would just like to know.... 

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