hooking up problem :(?help?

so this one girl who I dated texted me out of no where and we texted and I told her I would like to hang out like 3 days ago but then she told me all about her boyfriend so I just ignored her completely afterwards then she recently sent me a text and I replied and it ended up with us actually hanging out , and the last time I went for a kiss with this girl it happened and she was dating her boyfriend at the time a few days later they became official , but the last time we hanged out I didn't go for a kiss and it didn't happen , so im starting to think the more I don't just go for it , is the reason why I didn't get a kiss so im thinking of going for a kiss this time but I don't know if she will this time , but im sure she will cuz last time she did but she was only dating her boyfriend at the time they weren't official now they are she can't stop taking about it I really want to make a move because I feel bad everytime I don't , I was to make a move confidently