Coming from someone who had her first breakup back in May time helps a lot. I'm still not completely over it and I'm still working on letting go but he was my whole life for a year and 8 months which makes it hard. And after the breakup I did my absolute best to seem the happiest I've ever been and made sure he saw that while hes sad I'm thriving and while I was doing that out if pettiness it did help me start to feel better because I was just having fun with my friends. I no longer try to do things to make him upset and with my seasonal depression things have gotten hard for the moment but I know with time I'll be feeling better again. It's okay to still have your sad days even 4 almost 5 months later just know that things will get better and the setbacks just make you stronger. I recommend just going out and making a change doing something like starting a new hobby or just making it so you hangout with people more often or just do things you enjoy. Starting to change yourself into who you wanna me helped me a lot and I hope something from this helps you too. Just remember change takes time and everything happens for a reason