First of all, that sucks and I’m sorry. It’s the worst. I think almost everyone has been there.
And almost everyone will tell you it absolutely 100% for true gets better. No shit, it gets better in almost every way.
Situational depression is a thing. Talk to someone about temporarily using a serotonin inhibitor to stay out of the lowest lows for awhile. There’s no need to rawdog it just because (like the rest of us) you’re a stupid guy who’s been taught to hide your emotions and act stoic in the face of heartbreaking shit.
And make some plans. Do out-of-the-house things. Anything.
It takes about a year to get some distance, at least that’s my experience. But there’s no need for any of it. You’re going to be better, happier, and wiser. It just takes time and being nice to yourself in the meantime.