Your mental state after breaking up with your partner of several years is likely going to be very dire once all has been said and is now out of the way. However, there is no reason for you to feel like you will never be capable of attaining happiness ever again. The reason behind this is that it can often be surprisingly easy to get over a breakup, especially if the person that you were with was not all that ideal for you in the first place.
When it comes to handling a breakup with your ex girlfriend, the first thing that you should do to get over this experience should involve downloading a dating app as quickly as possible. This will enable you to meet other people who might just be even better for you than your ex had ever been. A few casual flings here and there can go a long way, and they have the potential to give you a lot more perspective in life since you would realize that there are plenty of fish in the sea and all of them will make you feel good about the manner in which you have currently chosen to end up living your life
The defining characteristic of breakups is that they can be really toxic, so you would do well to remove yourself from the situation as quickly as you possibly can. Delaying this will end really badly for you, so we would recommend that you act really fast lest the psychological damage that your breakup has caused turns into something that would not dissipate soon enough to let you get back to mental normalcy.