He has never committed and he does not mind seeing other girls for marriage, these two things imply that he is not meaning serious relationship with you. More over you surrender your body to a person that does not hold any commitment or sincere feelings. This must have taken away interest from the relation more. In other words, you have been taken for ride. Sooner you accept this fact better your self-respect will be preserved. Accept that this relation is not going to work out.