<human>: Condense the text into a few key points

My girlfriend and I have been dating for 3 wonderful years and everything about it is amazing. She's my best friend, is always there for me when I need her and couldn't ask for anyone better to be with. The only problem is that recently our sex life has  merely disappeared. For the first few years everything was great. We had sex multiple times a week but suddenly it slowed to a halt.  She never seems to be in the mood ever and it sees like there's always an excuse when I try to initiate. We've talked about it before and we always agree to work on it but it hasn't amounted to anything so far. It's become somewhat frustrating to me because I have a relatively high libido.   I'm at a loss of what to do. She isn't on any medication that may inhibit sex drive if that makes a difference.
<bot>: girlfriend and I of three years have seen our sex life completely disappear and I'm at a loss and don't know what to do.