shy boyfriend

never posted before so here goes! I've been seeing this really nice guy for a couple of months now but he gets really nervous when he's around me...until recently he was even too shy to speak on the phone unless he'd been on a night out! he's in the army so we only see each other when he's home at the weekend at the moment...last weekend I thought it was THE date but we ended up going out for a few drinks (his suggestion, possibly nerves!) and got quite drunk. we got back to his and I practically pounced on him, he couldn't get an erection and just kept telling me he was nervous. I really like him but what is the best option here? the next day I apologised for making him feel awkward and he just said I didn't need to apologise and that it was because he was so tired and had had a few drinks so he won't even discuss his nerves with me which makes me feel like it might make him feel worse if I broach the subject with him. Any help at all would be amazing!