Hello, I can empathise with you... No one has right to do such undignified acts and that too with partner..You should talk to your parents about it and also his parents about it as if you don't take action this time.. It will become a routine ... You have full right to be happy and yes everyone needs space but not for cheating in any sense.... Harming yourself will not solve the issue.. Just talk to him again patiently and also close person about it and also consult a psychiatrist for individual or better couple therapy for working out in this relationship... Hope it helped you.. Feel free to reach us