Confused and stuck in the middle

So I am wondering if I'm making a mistake or not, I am so screwed up by past relationships that I automatically assume the worst. For example women fall in love with what they hear, and men lie about what they say. Well he says everything I want to hear, and makes me believe it. Yet in the back of my mind, I'm screaming. In the back of my mind I'm convinced I'm being used. I sit here and pick myself apart, wondering what my flaws are. I talk to him, I get nothing but compliments. Yet again I'm screaming in the back of my mind to RUN! How much longer before he walks away too? How much longer before he changes? How much longer before you realize your being used? You messed up girl! You gave in too soon, so what if you haven't since. You gave in too soon and he's not even your partner, he's just waiting for you to give in a little more. Well this is what I have to say to the little voice screaming. "SHUT UP! He tells me what I like to hear, I feel comfortable, and I SMILE! So what if it's momentary, so what if he leaves the next day, so what if he says it was just some fun! SO WHAT! The fact is girl, is that you got to experience it! So enjoy it while it last and maybe you'll be surprised by how long it lasts. After all he did hold your hand in public."