What the fuck yourself? You absolutely can’t expect unilateral one-way commitment from someone while YOU’RE still free to casually date. If neither of you have made any such assurances of exclusivity, your talking stage has no right to expect any differently from you. Being ‘faithful’ to someone you have no reason to think is monogamous isn’t reasonable and certainly shouldn’t be the standard; it’s, at best, someone’s weird fetish. If you don’t like it, find someone who’s ready to commit to you.