limp d*ck

hey girls:) so I kinda have a problem and i’m not the most experienced when it comes to sex and I really need some good advice! So i’ve been talking to this guy for a few months and we finally hooked up today and thinks we’re going great until he put on the condom....his dick literally went limp. so I gave him head and we tried again, and again until I finally just let him finish another way. but does anyone have any ideas why this happened or how to fix this? I really like this guy so i’m willing to try again so i’m just guessing it was a wrong size issue.