I'm a bit worried that my partner is more than friends with his co-worker. He talks about her to me frequently. She's messaged him in the mornings saying she will not be in work when she could have rung up the office. There were kisses on text messages she sent him and he sent one kiss on a text message back to her. She's a lot younger then him. She also has a partner. They seem to have recent conversations with another ( he tells me in a conversation out of the blue) when he rings me up on his lunch break it's only briefly 10mins when his entitled to an hour. He leaves for work early and leaves late. I do trust him. Am I paranoid? Or is there more to this?