We had a very long foreplay, and I personally wanted it to be like that. While we are having oral sex, my penis is very hard and there is no problem. But whenever the condom comes out and I try to put the condom on or after putting it on and about to start penetrating, my penis becomes soft. We’ve tried it twice so far and this is how it worked. Then I get bored and my girlfriend gives me a blowjob and I cum by masturbating with my own hand. I don’t feel anything like performance anxiety, my sexual self-confidence is high and my libido is high as well but this is what happened twice. My girlfriend is actually very understanding about this situation and motivates me by saying things like “we’ll keep trying babe” and “it’s okay”. What could be the reason for this and how can i fix it?