how do people get over breakups?

Context:

It has been more than 6-7 months since me(M21) and my ex(F20) broke up.

I know people are gonna laugh at this but it was an online relationship for 2+ years, we never actually got to meet each other in person as we both are students and can't afford to travel to the other corner of India by ourselves.

As much as many people would think it was not something serious, it was the best 2 years of my life, for the first time I felt like I actually mattered to someone, it was going so well and we had it all planned out. I do get it that it was hard doing LDR when you haven't even met the person once but we did vc everyday and tried our best to communicate about any and every issue we faced, always tried to make sure both of us went to sleep with a smile on our face.

What bothers me the most is that the breakup came out of nowhere and just one random night she wanted to end it all. I had made plans, booked tickets and gotten gifts for her but guess what just 2 weeks before we were going to meet, we broke up :(

Now even after all this time whenever I'm alone all I do is think of her, every song she recommended me, the memories we made, thousands of photos i have of her, how I'm doing everything she wanted me to do but alone.

I've tried everything but nothing seems to work she's a thought in the back of my mind that never goes off.