Good for you if your in that situation. It's difficult to find someone that you truly love, and loves you for who you are. If your ready to make that commitment, then more power to you.
As for me, I thought I was ready to make that commitment sometime ago, but, I'm to young, and I'm not ready to settle down yet. I thought I'd try to fuck her for a while, and see where that goes. It did go, and it went. But, as time progressed, I got real bored. I was tempted several times to start several relationships with other girls that I meet at social gatherings, but, that would be a harsher form of cheating IMO. The urge was really strong to sleep with different girls. So, I gave in, and hobbied again. Hey, it's better than actually starting several relationships behind your SO's back IMO. This way, I don't have to talk to them again, take them out to dinner, they harassing my phone calls, or what have you.
But, if your ready, then good luck and congratulate. Hopefully, when its time for me to settle down, I'll do it with some commitment. But, definitely not now. Anyhow, good luck!