Sorry about that bruise, babe. I admire you for putting yourself out there with that photo. You got the worst of that encounter but as any tickler knows, a ticklee who is not restrained can hurt you, too, no matter how submissive by nature she may be. Elbows to the gut, knees to the jaw, heels to the nose - ticklers risk that and more when they want to tickle a girl as if she's tied down even though she isn't.
If you cannot trust him to let him tie you down, that black and blue mark is not the last injury that will result from these tickling sessions. Some advice, even if you are not asking for advice: Stop seeing him if you do not trust him enough to restrain you. But if you do want to give him a chance, remember that allowing him to tie and tickle you once does not mean you have to keep allowing it if it turns out to be too intense.