@MillieBee depends on the situation
Was it intentional or accidental?
Was the hurt caused because they were fighting for you and to keep the relationship or because they were a genuine butthead?
This is a hard question but yeah I ended up dropping a lot of money and time on someone I loved and she ended up taking the stuff and moving on with another guy. So yeah to feel the pain of knowing I wasted time and money on her hurt a lot but life is to short. After dealing with 4 failed relationships I finally found the woman I’ve been dating for 3 years Now ( the last few were like a few months or year each ) I used the hurt and pain and anger as fuel to better myself and used the hurt to understand to see and avoid certain attributes in the women I dated.
So I guess bottom line learn from the mistake and learn from the warning signs and use them to your advantage to find someone who likes you for you. If that’s the case obviously if they did it unintentionally then talk it out. But communication is also key.