Got punched in the chest, it was hard to breathe after

My boyfriend and I had a fight yesterday and he pushed/punched me in the chest that i fell on the ground, it got so hard to breathe after, i was gasping for air but i could breathe after that. There is a slight bruise. Should i get it checked out? It still hurts sometimes up till now.

UPDATE: thank you ladies, for all of your concern. You have no idea how grateful i am to know someone around the world cares for my wellbeing.

Just a little background, my boyfriend and i have been together since dec 2016, and recently last august he had found out that i had snuck out to parties behind his back. I know, it was terrible of me to do that. I did not cheat on him, i am not justifying myself... i know im in the wrong and i have no idea how to express how truly sorry i am for having done that.

Since then, our relationship has spiralled out of control. The love has gotten less and less and i'm going out of my mind. I have cried infront of him countless of times, most where he doesnt give a shit about how badly i am crying. I have begged for his forgiveness, on my knees, in public as well. Most of the times when we argue is when i make a big fuss about him not showing he loves me anymore. He doesn't hold my hand, nor kisses me first. The only time i feel theres some kind of love is during sex, only then he holds and kisses me.

My mental health has gone way out of control than ever before. I think of dying every day. I am living in Singapore, where mental health care is super expensive, and im not able to afford it as i'm only 21. I live with the guilt, the sorries, and feeling like im no longer loved by him. He says he still loves me but love just isnt enough to fix what i have done. I've never loved someone this hard in my life, and i've no idea why. I do not know How to make him love me anymore. I cant leave, i cant do it. I really cant do it......

All that i am is sorry, and greatful that he is still with me despite my mistakes. I know he is trying to forget, but i just wish he'd show he loves me again. Only then i have the motivation to carry on fighting and prove to him that i am, indeed, sorry.