Masturbating behind my boyfriends back

So my boyfriend (25m) and I (26f) have been together for about half a year and are very serious about each other. I love him so much but he’s a virgin and wants to wait until marriage before having sex. I on the other hand am not a virgin and used to be sexually active with past partners. I like the idea of waiting for marriage but im also extremely horny 24/7 and sexually frustrated. We’ve been intimate by doing other things but I miss sex. I want to be able to respect his wishes but because of my own struggles I’ve been resorting to masturbation to help ease the frustration, it just doesn’t scratch the itch the same way sex would and its not a satisfying as it sex would be with my boyfriend. I feel like I’m cheating on my boyfriend in some way by masturbating but if I don’t I end up trying to get him to sleep with me and I don’t want to pressure him before hes ready.