Random negative thoughts?

In anything that makes me happy I always get negative thoughts. I've been in a relationship with this amazing guy for 4 months. I've been in relationships before but been used a lot so that's part of the reasons I have negative thoughts. Like recently I think "wow he hasn't said I love you in a week does he still love me?" Or he hasn't asked me how I am or how my day was or how I slept which causes negative thoughts.