Is she lying or am I paranoid?

Hi, I've been withy girlfriend for 9 month. Couple of months into our relationship we had several arguments and we temporarily broke up. Allegedly, she got with someone else to get rid of me. Few weeks later we clarified matters and she swiftly explained that the reasons why she was with him was because she wanted me gone, nor did she want to think of me. I took her word and we got back together. However, I have suspect feeling she liked the guy, without sounding paranoid there's multiple reasons why. Some of the texts messages exchanged during the time I was absent revealed that she had been slagging me off somewhat to him, they were constantly talking saying I love you blah blah blah; the usual nonsense. Nonetheless, I took her word as she said she is no longer speaking to him. However, very recently he messaged her and they subsequently exchanged messages. Some of the things she said were comments like: why did you lead me on, you said you love me? He responded saying he was sorry, he merely took her as a friend and nothing more. Moreover, he messaged saying he wanted to come and see her, to which she responded come down i shall make a decision. Apparently, after I saw the messages the reason for them was to show me that she wasn't, in actual fact, in a relationship with him in the first place. Moreover, she insisted she never liked him it was nothing more than getting me off my back. Surely, this cannot be plausible as no girl would make suck comments like that for the point they're proving? Am i just paranoid or is she lying?