I am so confused

So it's about my ex whom I just broken up with three months ago, our public exam results are released recently and then him whom I didn't contact with and had unfriended on Facebook and Insta for the past few months suddenly popped out in my messenger and asking about my results, which totally freaked me out, I mean, why's he still trying to contact or talking to me? I'm scared to talk to him because I'm worried that my feelings and hopes will be rekindled back but in order to be polite I responded him quite coldly and only sent short messages, as a well to protect myself from falling into him again i guess. So he's been actively talking to me and then asking me about the reasons I unfriended him months ago, and I blurted out that I heard rumors regarding him having a flirtationship or being shipped with another girl which made me pretty pretty heartbroken and sad enough, that's why I unfriended him in order to move on (of course I wanna move on too after I mentioned about the breakup). And then there's him explaining everything that it's just a joke that couldn't be taken seriously and he explained that it was his manager and colleagues that did the shipping, I don't know whether the flirtationship is true or not but I'm already really sad regarding the shipping and joking stuff. So he's been actively ttalking to me and asking me toabout rresponse (because I respond in a cold way and could say I almost completely ignored him) but the third day his attitude completely changed and then he's the one that treated me cold and sent short messages. I was so confused why'd he do that? I mean how could he change so fast by being cold at the third day or why's he still talking to me despite after the breakup? If he still had feelings for me but why he recommended about the " let's just be friends right now?" Man I'm feeling so guilty when he treated me cold (even though I'm the one who treated him cold first when he starTed talking) because I felt like I gave him the feeling that I just rushed into conclusions without checking whether he really had a flirtation ship with another girl or not, but I'm also confused if he's not doing flirting why are there rumors outside? I'm kinda happy inside when he starTed talking to me but I don't wanna get back to him again because he's been very controlling since the two times we've been in a relationship. Am I normal to feel confused? Help?