"she has not done anything necessarily to deserve it"
"for some reason after we made a decision for her to finally move in with me, I have been really considering breaking it off"
"makes me realize that this is a long long term commitment"
--> Commitment issues are becoming realized, she is serious about this
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"pressure on me to replace what she is leaving behind and I alone cannot replace that, it is so stressful"
"we are talking marriage and babies for a destination."
--> You two are planning a future together, this is probably putting on more strain?
You post, you ask questions, you give facts --> I reply, I give quotations, I have opinions