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

Last November I met Matt at a party and we dated for a while but we both decided that we didn't want to be in a relationship. Instead we've been friends with benefits since January and things have been great between us. Not only do we sleep together but he's also my best friend and we care about each other a lot.

Matt and I have both been dating people during this time, however he only recently told me about a girl he met in Janurary. He described her as being perfect for him as she was extremely attractive and they had common lifestyles (they both train for several hours a day at the gyn). He thought things were going great with her but she unexpectedly broke things off with him in April. She wouldn't explain why and it devastated him. He fell into depression and I have been helping him through it.

This is all fine.The thing that really irks me is the fact that he didn't have sex with this girl he was so clearly in love with, and the fact that he regularly had sex with me (3-4) times a week while dating her. I just can't understand the reasoning behind that. Any thoughts/ suggestions would be greatly appreciated!
<bot>: Friend with benefits of 6 months was dating the perfect girl for 4 months but instead of having sex with her he continued to have sex with me.