No, I don't think you are a slut at all. You simply were desperate to have a sexual connection with someone else which is a normal human desire. In fact, it sounds as though you had gotten to know this man for a while and genuinely felt a connection there. It's not like you just slept with some guy you met at a bar or something of the sort. This doesn't sound like "slutty" behavior, it just sounds like a normal woman who was interested in a man sexually