I don’t know what to do!

I’ve been with my girlfriend for around a month/two months now and we have been getting off and all was well, orgasms were bliss etc.

However, this past week or two, I haven’t been able to cum or event get wet.. what am I or are we doing wrong? We usually just kiss and start as we are kissing, kissing at the neck sometimes too..

Is there anything to help or is it just never going to work...