Dont There is nothing wrong with a ONS, if indeed that's what it is (you might see him again ). You're not a tart, you're a grown woman in charge of your own sexuality. It's there to be enjoyed, not to feel guilty, dirty or sordid about.
And do not ever go back to Geeky. He was a bell end who embarrassed you on the Eurostar, an abusive wanker who didn't even deny he was an emotionally abusive fuckwit, and a manipulative bastard who tried to keep you as a fuck buddy once you'd broken up. He treated you appallingly. You deserve much, much better. Hang on in there - the pain will lessen, as will your feelings for him.
White What I'd do now (and what Matthew Hussey recommends) is to agree to keep it casual, still go on the dates with other guys and (this bit is the key, according to MH) let Baldy know that you're dating other men. If he asks why, just say really like him but you're looking for a partner in life and until you've mutually agreed to be exclusive with someone, you're going to keep dating. The reasoning behind this is simple, according to MH. If you say 'Be with me, or I'm leaving' chances are he'll withdraw because men (and women I guess!) don't like to be given ultimatums. If you say 'Yeah ok, let's keep it casual, I'm fine with it' he'll think you're happy with this and won't make any effort to progress the relationship. So you say 'I like spending time with you and still want to see you but agree let's keep things light for now - I'm going stay on the dating sites and am open to going on dates with other men. Let's see how it goes.'.
At the minute you're on the back foot because you've told him by text and in a phone call that you don't want to date anyone else as you're seeing how it goes with him. So now he knows he's got you hooked and he doesn't need to make as much effort to keep you, in fact you've effectively told him you're going to be sticking other him even though he's openly said he'll be dating other women. It's up to you how you play it from here but if it were me, I'd be sending him a text saying I'd had a rethink and the 'I like spending time with you...but am staying on dating sites and open to dates' message. It's completely up to you though - you know him (and yourself) best. At the minute you're putting all your eggs in one basket (Easter pun!) while he's got a variety of baskets for his eggs - and there's alway the risk he could pick another basket. Keep your options open.
I honestly wish I'd read Matthew Hussey before I started seeing MCS - I'd have played things very, very differently.
Dippin Did you call him on it? I would have - lying about your age is crazy because it'll come out eventually. Go on the dates with the other two though - just a quick coffee date will suffice to see if you like them enough to meet up again.