Without knowing more about your relationship it's hard to say. As you said this tends to be a pattern with you, so you might want to take a closer look at that. Sometimes when we fear abandonment we start looking for problems in a relationship so we can end it before we get "abandoned" then it becomes a self fulfilling prophecy. On the other hand the relationship may have run its course.

The only way to really know is to talk to your partner about this. They may surprise you and say I feel like your pulling away, or something like that. But they may be having questions about the relationship too. The only way to really know is to ask.