Hey Simon66,
Basically Yazoo71 covered most of what I was going to say on the subject. I'll add a little bit of my own experience to the mix, however.
I was dating a guy for three months this year. I had my surgery in early May and by the first of June he broke up with me. (Maybe he couldn't handle the weight loss?) My point being is that you should do the surgery for you and no one else. If a guy can't accept some loose skin, then do you really need to be with him?
From my own personal experience, I can tell you that my surgery has been life changing and transformative. I feel better. I move better and I have more confidence than I have in years. Like a lot of guys, I spent years on diets losing enormous amounts of weight only to gain it back.
Don't let your dating status define who you are. Make smart choices for yourself and surround yourself with supportive positive people.