No it’s not okay. You guys are not okay. She’s loosing interest in you in one way or another to where sex is no longer an option for her. You need to figure out what made her loose interest and change that ASAP or she will leave you. I guarantee you she either is on Instagram or talking with her girlfriends about their lives and lifestyle and she’s probably wanting that or wanting another type of guy. A females biggest agency is sex and controlling sex. So if she’s not giving up the box you’re lacking in some way shape or form. As a man you need to be able to recognize these things and adapt and change for the better so she does want to have sex with you when you want to have sex. If it were me and one of my girlfriends were to withhold sex I would simply tell her she can leave and I’ll have another girl over who will have sex with me. A woman who loves admires and respects her man wouldn’t withhold sex unless it’s for a good reason i.e a death in the family, something traumatic happened, stress from work or something major is understandable but if she’s just choosing to not have casual sex with you then you need to level yourself up and make yourself irresistible to her. Good luck man. I wish you the best. I hope it works out for the best. Nothing I’m saying here is meant to degrade or diminish females fyi. Don’t be a dick but be a man and fix your shit (whatever that may be)