I'm stupid and I'm well aware.

My boyfriend for the last 3 weeks isn't sure if he wants me anymore or our relationship. It hurts and I feel like I'm breaking. I'm just not good enough anymore and I'm so helplessly in love I don't know what I can do because I know his feelings won't change. I don't know what it's like without him and I'm so attached should I just accept he feels this way or leave?