10 Signs You Could Be in a Toxic Relationship, According to Experts

If you find it hard thinking about things outside of your relationship — and not in a good way — this could be a sign you're in a toxic relationship. "Your relationship may be toxic if you are noticing that almost all of your brainpower is spent thinking about the relationship," Cook says. For instance, you may be checking your phone excessively or wondering, "What does it mean that they said this?" or "What are they going to do next?"