M/27 in a Healthy Hopless - Romantic Relationship with 24/F

I'm currently having this problem with my partner who is healthy hopless - romantic. We help grow each other in all aspects of life except that she is not romantic - she is not clingy, doesn't want to be touched in public and privately, you have to try, try and force before she gives in to sex. We've talked about it severally but she is still the same. The thought of being in the mood for intimacy and not getting it is hunting me and sometimes I just think like maybe she is cheating. I have thoughts of leaving her.

Please any advice on how to handle this situation would be greatly appreciated?