shitty feelings

I'm going out with a guy, and he's like super cute and kind and all, we went out today and I was really happy, but I was overthrowing everything the moment I got home. 

I asked him if we wants a serious relationship and he told me that he didn't know, but that he wanted something with me, and like I know we're just getting to know each other but every time that my exes said that it ended up to be a shifty relationship, and I don't wanna feel like I did before, but I'm scared that me telling him this will make him less interested in me.

I'm actually so sad right now, he begged the whole day for me to kiss him, and I didn't wanna because I was scared that this wasn't gonna last but I did it anyway because I want him to love me. 

I don't know what to do now.