I’ve been faking it 😔

I’ve been faking it with my boyfriend for the past 7 months. Our sex is legit incredible and I love him more than food lol I just can not have an orgasm from sex or four play or anything. I only can with myself. Which that’s all normal with most women. But when I first met my boyfriend he was so determined to get me off and he’d kinda seem defeated when it wouldn’t happen and he would say I’ll get it next time.. the girl he dated two people ago always got off from sex which I mean maybe but she probably lied as well lmao but his last gf he complained she could only get off from being on top which is also normal. But I just can’t no matter what I never could. Doesn’t mean our sex isn’t good. I get to the point my legs shake and I feel like I can’t handle it anymore like it’s awesome I just don’t cum. Now we talk about getting married and I’m moving in with him this month and I feel like I have to tell him bc I love this man and I hate lying to him about anything at all it kills me. I’m just worried it’ll ruin are sex life or his trust for me.. idk how to tell him or if I even should but I can’t keep faking it.. it just doesn’t happen for me 😔 I wanna just talk to him about it now but he’s away on army business without a phone till another week and a half then he will have his phone but won’t be home for another 2 weeks after that. I just need some advice bc I feel like shit rn after talking to my bestfriend about it and idk what to do.. our relationship and sex life is so perfect I don’t wanna ruin it.