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Chloekim I had a
wonderful relationship with someone who did something similar to me...telling me she loved me while sleeping with someone else the whole time. She continued to lead me on thinking I had a chance after she'd already entered into a relationship with this other woman. Come on.
It's very hard to be so in love with someone and to have them hurt you so badly...brings up all sorts of nasty feelings: What was wrong with me? Why was I not enough? Did I do something wrong?
Honestly, what your ex told you is almost exactly what this particular ex told me. "she didnt know what would happen in a month or in three months." I don't know your ex, but I can tell you that this line is used A LOT by manipulators who want to keep you emotionally engaged when you are really just "back-up supply." It is a huge red flag.
My recommendation is to disengage from this person, give yourself space, recognize that you are a good, worthwhile person who is capable of caring for someone even if they are doing something painful to you and that this is not a bad trait. It means you are an emotionally honest person who can love someone when it's challenging. One day you'll meet someone you can direct that energy towards who wants you to be happy and they will appreciate this quality very much.
I hate to rehash what everyone else has said, but they are right that time is really the only thing that helps these feelings. Please just know that we hear you and your feelings are legitimate. let yourself grieve if you need to and don't let her comment about you being on the dating site get to you- you are the one who is reacting in an emotionally healthy way by grieving a relationship which clearly meant a lot to you.
Hope you start feeling better soon!