Need someone to lean on

So I have been with my other half almost a year now. He has a problem getting hard and staying hard. There are times we will be going at it and he says that his tip goes completely numb. He used to worry because of his exs but now he's getting more relaxed about it but it still bothers him. Sometimes when he goes completely soft he gets mad and then I feel completely helpless. We have tried to extend foreplay and many other things. He's tried testosterone boosters and nothing has helped and I want to be able to help but I'm not sure what to do. It's been over two weeks since we actually could do anything together. I'm just feeling lost in this all.