I don't know what to do... 💔

Ok so this could be a long one...

So me and my boyfriend have been together just over 3 years. Things were going great at the start, we used to love spending time together, used to constantly check on each other & the sex was great! We used to do it every day an it was AMAZING. But I don't know what's happened over the past couple years but everything's changed. And I get that you get used to each other and the honeymoon phase dies out but it's more like a friendship now than a relationship. We might have sex once a week if that, and it's boring. It's over and done with in 10 mins and we only ever do it when its convenient for him. Like I could try and instigate it and he'd immediately shut me down and say "not tonight I'm not in the mood". He always says that he hasnt got a high sex drive but he wasnt saying that when we were doing it multiple times a day when we first got together?? He knows that I DO indeed have a high sex drive and it drives me insane when we can only do it when he wants to. Obviously I'm not going to force him to do anything he doesnt want to but it would be nice to have it more than once a week... and I know it's not all about sex in the relationship but when you go from having it constantly to rarely having it.. its fucking annoying. I've tried to speak to him about all of this and nothing good ever comes of it.

The relationship itself is a mess too. I struggle with depression and anxiety so my head is constantly doing somersaults with my thoughts. One minute I'm like "I think we should breakup this isnt going anywhere" and the next I'm like "I love you so much I dont want to leave you". We constantly argue, never spend any quality time with each other and he never wants to go out with me but as soon as one of his friends gives him a message he doesnt hesitate. Im just really fed up of my thoughts battling together. I just dont know what to do and thought maybe some of your guys opinions might help 😔