Hi TB666.
I agree with Wandrail. Getting involved in a situation like that isn't worth it. No offense or anything. If she only wants you to be a mere fuckbuddy, then obviously she does not care about your emotions. Sure you two would pleasure each other physically, but when it comes to a relationship, it needs to be much deeper than just that.
If you would like to be involved in a relationship, perhaps talking to someone face-to-face would be more appropriate. Dating services almost force a person to be involved with someone, even though they may not be a match, if you know what I mean. Sure you are the one who contacted the dating service, but other factors are involved. Let it come naturally.