Am I wierd?

Well, in August '07 me and my first real boyfriend broke up after six months (long story) and I was just thinking to myself about everything me him and I used to say. That we loved eachother, cared for eachother, I always said he was hot and he always called me beautiful ... And I found myself thinking that (after I found out he had a new girlfriend) everything that he used to say to me, every promise he made me, any trust we gained, anything intimate we shared, he would now be doing all of that with his new girlfriend... And I find it a bit ..Wierd? Would you? Well, not wierd, neccessarily, but kinda ...Strange. Like, I can just imagine him flirting with her when he started to like her, then asking her for pxts for his fone then asking her to meet up everywhere .. I find it a little wierd and unnerving in a way. So, I'm just asking any person out there, is it normal to feel this way or am I just a wierd wierd liitle girl?