Regret or selfishness!

i was with my boyfriend for about 1 1/2 years and during this time i met another guy that i immediatley had a bond with and got on well with. To begin with we where just friends and then it led to more. He ended up falling in love with me and i was feeling the same. I think this was because my boyfrined i could never talk to or have fun with. I tried calling my affair off many times but i kept going back and it wasnt the sex, it was the connection that we had. There was always many rumours about the affair but i always denyed them. My boyfriend found out and i now feel like i have lost something that i really loved even though at the time i felt my love fading for him and because he walked away from me i feel like i lost out when at the time i didnt even feel guilty! I dont think it is regret just selfishness the fact that he walked from me & as always we all want what we cant have!! DONT CHEAT! it will always come back and bite you in the butt!