You mentioned two different problems: being stood up on first dates and, never having a relationship that lasted more than two months.Let’s start with the relationships that never lasted. You didn’t tell me why they ended. You ended them? You got dropped? The fact that no relationship has ever lasted can be a symptom of more than one type of problem. I’ll give you a couple of ideas, and you can pick the one that fits. One possibility is that you latch on to any guy that will have you (since you are so grateful to have someone that actually sticks around). And, then because you aren’t selective, you soon find out that the person you settled on isn’t right, and the relationship ends. Another possibility: You are unconsciously playing out a pattern that you experienced or observed during your childhood. Were you raised by only one parent who dated a string of lovers? Did your dad leave your mom or vice versa? Or, where you abandoned when you were young. These are some possible explanations for why your relationships don’t last.Now, as for the first question, why do guys stand you up. There are two possibilities here. One, that you are so afraid to get involved, for the reasons mentioned above, that you’skunk’ men; in other words, you send out signals that say, get away from me. And, as I said above, your unconscious signals may be designed to protect you from getting close and being disappointed.There is also other possible explanation for why men stand you up. If you are as beautiful as you say, they may feel terribly threatened by you, and feel unworthy of you. I have known many attractive women who can’t get dates because men are afraid to approach and be rejected by them. If this possiblity turns out to be true, then, we can also understand why you would be inclined to take anybody that lets you in–only to learn in a couple of months that the person is dead wrong for you.I hope that my answer solves the mystery for you.