To feel this way?

[Krishna1]

I'm new to this so I do apologise if I come across wrong at all.
My DF and I met years ago and have been living together for a little over 1 year, engaged since the beginning of this year.
We have an almost sexless relationship. For the first few months, the sex was incredible. Then things happened (DF diagnosed with depression, myself diagnosed with bipolar) and sex became less and less frequent. Fast forward to now and it's pretty much a non-existent thing.. as in maybe once every two-three months.
It's hit me hard as a major indicator for my diagnosis was my inability to go about my daily life without sex, so now I'm finding myself caught up in hating everything about myself because he doesn't want sex.
He says there's nothing wrong with me and that it's because he's tired, but he finds time for everything- and everyone else, but when it comes to being alone there's nothing. AIBU to feel like he doesn't want me?

Depression/anxiety can really impact on sex drive.

I do not think “he doesn’t want” you , I think it is just another symptom of his current mental health.

But it is also important that you can both feel happy and fulfilled in your relationship. Perhaps you should seek counseling together to help overcome this issue?

Psychiatric meds can play havoc with your sex drive, antidepressants are notorious for it. Also, depression itself reduces sex drive.

As for you, hypersexuality in bipolar disorder is a symptom of hypomania. It's a symptom that you are unwell, it's not a good thing! They weren't telling you that it's part of your personality, or that you actually need that? You're doing it because you want that hit, that validation. Surely you can see that's really unfair on any partner? You don't actually want to have sex with him, you are just using him for the adrenaline rush/validation. No-one deserves to have their body and sexuality reduced to a prop in your illness. Are you taking your meds, having therapy?

Your initial sexual behaviour was a result of your illness, and now both of your sexual behaviour is being impacted by your illnesses, which are in turn having a knock-on effect on each other. The sexual problems are a symptom of a much larger issue, they're not "the problem". As you both get treatment and become more well, you will have to rediscover your sexual relationship, which is likely to look completely different to the way it did when you were both unwell. In the meantime, if meds are dampening your partner's sex drive, he could go back to the doctor and ask to change to a different medication.

That's the thing; I DO want sex with him, and not just for a fix. It's not always been this way for us, and neither of us were ill at the beginning of the relationship- I never 'needed' sex and he wanted sex. We have such a beautiful relationship and I couldn't be more thankful for him. He's kind, supportive, ambitious and has such a beautiful heart.
Admittedly, I do get times where I think I just need sex, but then we have nights where we seem like a normal couple, cuddled up, catching up on how the day has been etc. and things naturally begin to happen between us, but then he'll reject any move I make- leading me to feel the way that I do.
I know that I'm unwell, but I can't bring myself to say it out loud or to talk to my GP about it any further than the appt. where she diagnosed me. I just don't really know what I do from here.

As I said, it could be his meds. Some are known for making it difficult to get or maintain an erection, and some can prevent orgasm. So it's not necessarily even lack of desire (which is a common side effect of meds) on his part. He may be anxious that he can't perform, so pulls away from you. Do you think he'd be honest if you had a serious talk with him about any side effects he's getting?

He may also be suspicious of your motives. If he's experienced you being hypersexual before, he may worry that sexual behaviour from you is due to that, not genuine desire. I'm bipolar, and my ex said it could put him in a difficult position. He didn't want to 'take advantage', he didn't want to be a prop, and also, when you're in hypo, you're not exactly your normal, rational self! Apparently I can come across pretty mental at those points! So it could also be stuff like that going on in his head. Again, do you think he'd admit this kind of stuff if you had a serious conversation?

Wait, your GP diagnosed you with bipolar disorder? Not a psychiatrist? So what help are you getting?