the whole niece situation is kinda weird, so I will not delve into it a lot.
but, I can see a huge mistake you did: you agreed to one-sided exclusivity.
this is a big big big do not. exclusivity is either dual-sided or does not happen.
the way that has worked for me to lock a girl into commitment when she was resisting it (religious reasons in my case - age and family reasons in yours) and evaluating other options was:
a) see other girls. the best you can do here is have one other steady date and a bunch of booty calls. this is because the booty calls show you are a wanted man. the steady date is an emotional menace.
b) let her know you are seeing other girls. even better, let her find out. when she does, be very open about it. to the point of sharing intimate information. be sure to highlight the emotional connection between you and the other steady date. but don't do it in a bitter resentful way. it is just the way it is. you are not dating exclusively so you are free to see other girls, and are just sharing what happens in your life.
c) give this girl the emotional roller-coaster, be whatever she dreams of in a guy. orgasms, fun, many small wonderful memories to remember you by.
d) DO NOT, I repeat, DO NOT, act jealous of any other dude she is seeing. she will try to get even with you. DO NOT let her.
at this point, sooner or later, probably sooner, you can expect drama to start. she will act unsure, confused, will start clinging to you and wanting a deeper emotional connection. she might even say she wants to stop seeing you if you keep seeing the other steady girl (
she is the menace - the booty calls are auxiliary).
now you man up and keep your point. you will only stop seeing the other girls for a dual-sided exclusive relationship which both of you are going to share with the external world without shame. she will probably resist, and try to get you back into one-sided exclusivity. or she might propose a scheme of things in which the booty calls are OK but the steady date is not. you reject this. of course, because the other steady date is this nice sweet girl so you want her in your life. you want both of them in your life, UNLESS there is dual-sided exclusivity.
48 hours later she was my GF
