I love her but she still not only says he loves me ..?

When someone is going through a tough time like your girlfriend here. It's best to give her room to think things over with her ex. The comments, "I love you and living together." Was probably when they were dating. Every girl and guy that went out with each other would eventually say that to each other. If you truly do love your girlfriend. Be there for her when she needs her. But a support, when it's time. Try explaining your feelings to her. If she doesn't want your relationship to go something further. Give her more time, patience is the key to relationships. Your friends, if it annoys you with them showing you with post comments from Facebook with their relationship. Tell them to stop showing them that, however, if you are confident with your relationship with her. Then you shouldn't be worried about seeing the comments about them living together or of eternal love. Be a support to her. That's my advice for you.