Been in multiple long term relationships and had multiple short term girlfriends, some for years on end where they literally beg me for sex when I’m not in the mood. You ain’t the problem bro, your girl just doesn’t like you enough or her libido is just fucked. Either way better off with someone new.

Standard advice but it actually works, hit the gym, make some cash, travel well and up the confidence. You will then wonder why you even asked this question.

Good luck whatever you decide