Well, from what you’ve told me, my advice is that you should talk to him and explain to him the reason why you broke up with him in the first place, and then explain why you regretted it. Like, communication is the key in all sorts of relationships, romantic of not, so it is important to tell him your viewpoint AND listen to him explain his. 

Do you know the precise reason why you felt suffocated? It’s important to examine you own feelings as well. Was it something in his behavior that made you feel suffocated, or was it something external, such as work or school or family issues? One you’ve figured it out (or, at least, had a more-or-less clear idea of it), then you should talk to him about it so you can both overcome it together. You’ve said he told you he was hurt and would need some time to recover – so there is a possibility that he won’t be open for dialogue so soon. But you still should establish that communication channel as soon as possible, making him know that you want to talk to him without pressuring him too much. From what little you told me, though, i find it unlikely that he’d shut down all communication or something of the sort – but you should be aware that some time might have to pass before he feels ready to talk to you, if he was so badly hurt.

Relationships, to me, are something that has to be cultivated – like a plant! (it’s an overused metaphor, but works for this case). Like, when you plant a bean in cotton wool, all it needs for a few days is a little water and plenty of sun and it’ll readily sprout and grow a leaf or two, right? However!, after some time, the cotton wool alone cannot supply the sprout with the nutrients it needs, and if you don’t move the bean sprout to a vase with good, nutritive dirt, it’ll soon shrivel up and die. Like, the nutrients in this metaphor represent dialogue and effective communication, which are, as i’ve already said, essential to a healthy relationship. If something is bothering you in your relationship, you should feel free to speak up and discuss it with your partner – just like he should feel comfortable to do the same. 

tl;dr try to talk to him as soon as possible and, if he’s open for dialogue, explain to him the circumstances that led you to break up and subsequently want to make up. try your best to establish a solid, honest communication channel between you two.

I’m hoping i was helpful (though my tendency to write walls of text still get the best of me – I was trying to be concise, but that didn’t work out too well), and i wish the best for you two!