I may be downvoted for this but the fact that you asked this question is already a bad sign. I don't think the basis for keeping a relationship is just based on the fact that you still love him/her, many couples wouldn't have to break up if that for a fact is true. I think you know that is too simplistic.

Only you can say if it's still worth being with your SO (good Lord I hate this term, thanks internet). A lot of things will come into play here before we could give you a solid opinion about your relationship.

Have you been together long enough and got tired of each other?

-If your dating a person with marriage/partnership in mind and you can't stand them being around for too long/you got tired of them/you're not happy anymore and you did what you could to bring back the satisfaction/happiness/romance you once had with each other but still, no good, then probably you both are better of breaking up.

You're in a relationship for a few weeks/months and the proverbial flame isn't there anymore.

-Are you sure you loved him/her in the first place and it wasn't just physical attraction/lust? I know you're not shallow like that but it helps sometimes (I mean when I'm giving advice to friends) and I just have to put it out of the way. If you feel like there's a chance that you could rekindle the romance then do it. Don't give too many tries though, you will know when it's enough.

Is he/she hurting you physically/taking advantage of you/blackmailing you?

No questions asked, break up with him/her. Ask for help if needed.

What you're gonna do will depend on you. Most of the time we know exactly what to do, but we are just afraid to act on it because of the consequence. Do what you think is right, we'll never know what's the right course of action is until the whole ordeal is over. Hindsight is 20/20. Don't blame yourself if you happen to make the wrong choice.