My girlfriend and I have been together for like 3 years. Right now we are in a long distance relationship so there are plenty of hardships involved but we love each other very much regardless. Though as of late, I'm getting the feeling that she doesn't feel for me the same. Talking on the phone doesn't seem to interest her too well now, she tends to like talking online more from what I know. When we talk on messenger she use to type me long paragraphs but now all she does is type three words. Most commonly "Oh I see." I ask her if there is anything is wrong but she just says that it's the stress of going to college.
She says she loves me, but as of late, I feel there's something that is unsaid. It's really bugging me and I want to help her. She means everything to me. Any advice of how I may be able to help her?