what does it mean when he says he doesn't want to break up but he is not sure if he loves you anymore?

It means that your relationship might be going to the road leading to a breakup but it never means you can't turn back. Knowing that one person in the relationship isn't is important, you can't let he/she be dragged through a relationship only you really desire. You need to ask yourself this one question, Are you really happy? Being in a one-sided relationship is very hard to deal with and can lead you down the wrong path, its important to talk to the person about how you BOTH actually feel and choose if you want to turn back or head to the road leading to a breakup.

He might be indecisive how he feels or how he want to proceeds. You need to see what works best for you, and make decisions accordingly. Your happiness isn't dependant on someone else's presence or absence

When it comes to relationships they all have ups and downs. And sometimes this will involve not feeling as strongly as you did before. This is entirely normal and this does not mean that there is anything wrong in your relationship. Nor does it mean that one of you made a mistake somewhere. Though in order to truly understand how your partner is feeling one must first understand their own emotions. This often times can help address why one is not feeling as strongly as they used to. There are of course various reasons why feelings could suddenly change. The most common reasons being: -It's simply a phase in which they aren't feeling as strong and that there no contributing variables other than human nature. -That you and your partner are growing apart. Which is okay as there will be many relationships like this in nearly every person's life. Those were the common reasons for a HEALTHY relationship. If your relationship isn't healthy, (fighting, abuse etc...) there are of course other less desirable reasons for feelings to fade. The best option is to really talk to one another and try to figure out why there was a change in feelings. I truly hope this is helpful.

It means that he may be having some mixed feelings in the relationship. :)

It means that he is not sure where he stands at this time. He is confused about his feelings or what he wants. He needs to figure out his feelings first and ensure that he genuinely wants the relationship. He might also just want something to hold on to

it probably means he doesn't want to be in a relationship but still wants to be friends. by him saying he doesn't want to break up with you it may mean he still wants to see you and be around you and for you not to hate him

People can easily become attached. Even if they know they shouldn't be with someone anymore, they still can't help but hesitate. Also, there could be a problem with the relationship. If this is the case, it would probably be best to talk to him about it.

It means he has doubts, but he enjoys the comfort of what you have. You have decide if you are ok with that.

It means that he is scared to break up because of the change it would make on both your lives, but at the same time the dynamic of the relationship has changed. Pretty much I don't feel the same, but I don't want to leave you either.

It means that he wants to take a break to figure out what's really going on in his heart and mind. It doesn't mean that he doesn't love you anymore, it just means that he's confused and needs time to be sure.