What does it mean when a guy says he doesnt love you but acts like he does?

There plenty of reasons, to many for me to discuss. here's a few...

-It may be they believe you are not the right person for them.

-they may have hurt you and dont want to around you because they can not forgive themselves, no matter how much you say it is alright

-you have hurt them and they are just afraid of being hurt again.

-that they care about you but are not love with you.

- Or you may be reading to much into everything because you may still have hope at salvaging a relationship with them and want them to love you as much as you love them. usually the reason with those who've recently broken up