Exactly Captain,
Life is really short for it. If she has a problem with you then let her go. Don't try to stop, you will get someone who will understand you ( I won't say better cause everyone is). or Keep changing unless you find one (this is the reality my friend otherwise stop spying). You should be concerned but the other way. You need to know if she is leaving  you so that you can find one for yourself too.

Talk to her. She might be right every times. Tell her softly but clearly that if she has problem with you, she can leave. Don't ever try to blame her. She is also living a independent life as you do.

 Don't panic about GF. Relations form often. One in your destiny survives. Good luck!