A good friend (platonic relationship) is someone I can see every day, talk to about anything, and I want them in my life regularly. I personally cannot spend 100% all my time with someone who is just a good friend.

A romantic relationship is a good friend who I can live with and want to share a blanket and cuddle with at the end of the day. It’s someone I might want to hold hands with, kiss, or sleep with. It’s someone I want to come home to at the end of a good day to share good news, or end of a bad day to make it better.

A sexual relationship is someone I want to kiss and have sex with.

There are overlap. Romantic friends and friends with benefits are pretty common terms. Having a romantic relationship with sexual interest often ends up in bad relationships; I’ve heard this described as “feels like it should work” or “I loved them but I didn’t like them.”