I love her... but idk.

There is this girl that I was messing with for some time and we began to become closer and closer.. one day we would be good and have amazing days then next day she just wanted to be friends but this wasn’t until later on but she and I always said we didnt want to jump in a relationship without falling first so i thought we were on the same page(mind you we weren’t even in a relationship just messing around) so one day she was just being really suspicious.. she would be with this girl she said was “her friend” but never let me meet her or know her name but the girl “knew about me”.. then come to find out the girl and her had sex and then Stopped talking because the other girl had a girlfriend.. I was hurt just for the simple fact that she couldve just told me she was into someone else instead of lying to me and making me feel like I was buggin out. Now she been in two different situations since us and NOW she wants to act like I wanted her to from the beginning, and wants to “regain my trust”, and now wants to be serious because she now knows what she wants.. I love her but idk.. like I’m learning to forgive her and I’m sure she definitely wants to make things right and she beats herself up every day about what she did to me but idk what to do.. should I give it another chance in the future even though she did that to me? Am I stupid to even consider it?