<human>: Provide a brief overview of the text.

Myself and my girlfriend are each others first partner in both a sexual and relationship way. 

A few months back ago after a few drinks, we got home and she ended up telling me that she can't imagine only having one relationship for her entire life but also that it made her really sad to have this attitude because she loves me and loves our relationship. We haven't really talked about it since.

My point of view is quite the opposite. I'm fine with only having one relationship so long as its happy and I'm in love. The problem is that now I'm getting paranoid and insecure that I can never be enough for this girl. I don't want to be in a relationship that is doomed to fail from the beginning but I don't want to lose her.

How can I deal with this? I don't see any way other than breaking up with somebody I truly love. I'm not sure I can do that.

Any advice would be really welcome.

Thanks
<bot>: GF told me she can't imagine having only one relationship all her life. I can't deal knowing a relationship is already doomed to end