I Wonder If He Misses Me Like I Miss Him

So recently my boyfriend (online) just left me without any reason. At first when he started to ignore me I thought it was because he wanted space and was going through something in real life because he seemed upset, so I stayed without contact for 5 days, then I begged him for an explanation and he said that this was something he 'had to do' despite me telling him that whatever it was I would wait for him he said no, I really didn't wanna let him go because I really loved him. Despite being around 3000 km apart we planned our future together and agreed that we both had found the one, I spoke to him every night till very late and the days I was with him I was the happiest! After he left me I was depressed but I kept going because I was hoping he would come back to his senses and come back to me. It's been almost 4 months now and I still feel the pain and it feels terrible. The nights are just so bad, I just cry in my bedroom for hours and think how can someone do this to someone that loved him very very very much. After a few weeks after he left I went on vacation, the place was beautiful but I could not even enjoy myself a bit, I was constantly crying almost at every place i went, gaining weight from eating and I felt like I was in a place I could never be saved from. Months went by and it was still like that, me just being all miserable till recently I decided to stalk him on social media. It was painful as hell because he had many new females in his life and there was always flirty comments of his on their pictures. This made me sick to my stomach and I started feeling unbearable pain. I can't believe that this was the boy I was in love with? He was very loyal and never did these kind of stuff, even before I went out with him and we were friends he never behaved like this. Does this mean anything? When there are flirty comments on pictures does it mean that there is someone new in his life? Or is the comment thing just friendly gestures to improve someone's confidence? All these months I was being sad thinking that the decision to leave me wasn't his and that he was forced to after a family member interfered so I felt sorry for him but when I see this it makes me feel so worthless! I am really trying my best to move on but it is so difficult specially since I got no closure and had to assume the reasons for him to leave me. This is also shocking as he was the one mostly talking about the future together, at first I thought it was too soon to think of it as a 'forever' but as I stayed with him I realised that he was the one I wanted and so I wanted a forever with him too. I want to get over him but a part of me won't let me, it's like a never ending battle with myself everyday and every single morning I wake up with a gripping pain in my heart. I have trouble eating, sleeping and I don't do any more of the activities I used to enjoy previously. It hurts so much and I don't know how longer it will be like this. I know most online relationships fail but I have heard of many being successful and when two people love each other anything is possible. I keep thinking that maybe if I got closure I would be able to move on but I got almost nothing so it is really difficult. What's worse is no one understands, Im a lonely person and when he came into my life I didn't feel like that anymore, I have had tons of friends and all but he made me actually feel like someone. Another thing is that everyone keeps saying that I'll be fine but I see no progress. People keep blaming me for being with someone far away but they do not know that some people don't meet anyone in real life to date due to restriction specially if their family is very traditional. I just miss him more and more everyday and I am afraid that this pain will never end and it will haunt me forever, usually I take at most a month to fully forget someone and be happy but I just can't get over this guy and the way he made me feel.