It sounds like you're referring to the movie and perhaps noting that you relate to the character Tom (Joseph Gordon-Levitt) — "mtrjm" likely means "main toh reh jaata hoon" (I end up staying/left behind) and "rby kaml" might be "Rab ne bana di jodi" (a twist of fate) or something similar — but I'll try to interpret.
If you’re asking for a short on (500) Days of Summer from Tom’s painful, one-sided love perspective in a Hindi-Urdu mixed style, here’s one: "500 days of Summer dekhi… aur samajh aa gaya — main Tom hoon, uski Summer nahi. Woh chali gayi, par main wahi ka wahi khada hoon. MTRJM — main toh reh jaata hoon har baar. Shayad Rab ne kamaal kiya, par mere saath nahi." If you meant something else (like an analysis, a summary, or a meme caption), let me know and I'll refine it. 500 days of summer mtrjm rby kaml