Low libido?? Anyone have tips/advice?

I used to be really into sex and got horny frequently! After I started working full time and moved in with my boyfriend, I simply don't get horny anymore!

I feel like it has something to do with my shit diet (possibly a big factor??). I've gained a bit of weight and don't feel as sexy anymore.

I know my boyfriend is getting sexually frustrated but he's been very patient.

Any tips? I want to be able to go back to when sex was effortlessly amazing and not have to force myself to want it!