I met this girl online a few months ago. We messaged for awhile and then she gave me her number unprovoked. Texting was sporadic but light and fun. She suggested a meet up. She was super cute but of course I missed every ioi. Over the next month we met weekly. We kissed several times but I never escalated.
I work in the financial industry and have been very busy studying for some licenses needed for a promotion. I never really treated this girl like girlfriend material. Now that I'm done studying and want to take it further, the texts have stopped. She rarely returns my text. She finally responded after I asked her what was up and she said I'm awesome but too serious all the time. She doesn't feel like she can be "ridiculously silly" with me.
I'm not a serious guy at all, just worn down from stress over the last few months. How can I change her frame of mind? How does a guy convince a girl he can be "silly"?