some opinions please?

I think my previous relationship has really affected how I act and think in the current relationship I have with my boyfriend. My ex really hurt me, I was cheated on and I think what upset me even more was the way I was constantly degraded by him throughout our relationship; I was made to feel worthless, useless, and unworthy of any love. Now, I am always so paranoid that my current boyfriend is lying to me, that he doesn't actually want to be with me, he's only here because he feels bad or cannot tell me the truth or that he is entertaining other girls. I don't know what to do, I do not want to bring up my previous relationship to him and try explain or talk to him about these things as I'm sure it is irritating to hear that a previous relationship is still impacting me. I am desperate for the reassurance from him that none of this is occurring, that is all I need but I do not want to become an annoyance/burden that needs constant support due to her anxiety and paranoia. Am I being stupid? Can anyone validate my feelings and say that how I am thinking right now is understandable? I do not know what to do.