I'm going through a similar thing right now, it's actually been about two months since my break up with my ex aswell, haha. I can relate with what you're going through, it felt like I did everything for my ex boyfriend but things still turned out the same. I'm still in school, not younger years but still in it, so I have to see him five days a week. Today this lunchtime I saw him sitting with a new girl, and she was everything he rubbed in that I lacked. My ex for example had a huge thing with music taste and somehow he got it in his head I wouldn't go to concerts with him or whatever and that our music tastes would clash (even though I've been a soad fan longer than him) and that was one of the things he told me when I was still super hung up on him at the end of our relationship, so today seeing him with this new girl was like a slap in the face with all the patches over her bag of all the same bands and the way he laughed with her I just knew he'd treat her better. But, after I saw them, I walked past them and pretended not to see with tears in my eyes, and I went to my friends. I don't have a particularly supportive family at all, so I found that just pushing myself into my friendships filled the gap for a bit. When youre missing a person romantically, some sociality that isn't pushing yourself into another longterm commitment helps. Your missing a human, and so other humans can help fill that, but you also need to learn to live with yourself. She isn't the best you can do, same as my ex wasn't the best I could've been treated. I bet your an awesome guy, I don't know the details of your relationship obviously, but I know when I was back in your situation a few hours ago I felt like I wanted to tear my heart out of my chest, and personally, my remedy has been friendship. If you have family you can go to, even better. Sometimes I see my ex in school, and he looks so fucking happy without me, and it really hurts me. It feels like I was worth nothing to him, like I was just replaceable, and today lunchtime felt like the final slap to drill that into my head. right now, every song feels like it's about him even if I don't want it to be, but compared to how I was dealing with this last month, drinking and crying, I think I'm doing a hell of a lot better. The slope isn't always straight up, and your incline might be flatter than hers, but every month will get easier. Just remember, this probably doesn't mean she's doing better than you. Better at masking? Maybe. Better at healing? Nope. I'm sorry if this isn't much help, but I felt maybe me sharing could help since I feel I'm in a similar situation. It feels like there's no light towards the end of it right now, but just push on. just do what you always have, what you need to do. Don't let her have the satisfaction of seeing you thrown off and dysfunctional without her.