The use of viagra

For starters, my SO both love each other very much. Our sex drives are high and we enjoy the sex we have. Every once in a while by bf will go soft in the middle of sex and I try to not think much about it because i know it happens. However, last night he told me he wanted to try viagra because he likes the idea of not having to focus on keeping himself hard. I couldn't help but feel a sting from that. It basically felt like he said it wasn't me keeping him hard. I didn't say anything because I was hurt and wanted time to really think about how I feel before I bring it up. I'm sure he must feel embarrassed in a way but the way he brought it up didn't seem like he was. We're also both young (early 20s) and healthy and now I'm feeling insecure. Please, some advice would be nice.