So to start out, my fiance and I have not had any issues before. We were very affectionate towards each other. But when he told me that his ex and him started to talk again, because she told him that her one and a half year old could possibly be his kid (even though he has issues with his testicles), I got worried. They tried dating twice before, so I shouldn't be too worried. After they started talking more, he got a little less affectionate, but would still hold me, kiss me, and take me on dates. Should I be worried about his ex or not?

Ps. He would always remind me that nothing is going on and they are only friends, but something inside me is thinking something else.