Is my girlfriend(21F) not interested in me(23M) anymore?

So we met on tinder 2 years back, we clicked in a very short span of time. I’ve posted in this sub about my story. https://www.reddit.com/r/RelationshipIndia/s/8Wm83gSon2

Now the problem is she makes efforts once in while, like once in a month and rest of the days makes me feel like I don’t matter to her, I don’t even exist for her. She goes whole day without talking to me and expect me to behave normally when we talk. Is it common in a long distance relationship or she somehow lost her interest in me? She’s not cheating this is I’m quite sure of.