Is this common to finally get the girl ?

Ive known my gf since October and I talked to her on and off again several times in Oct,Nov,Dec so I figured maybe after talking on and off again maybe I could take her on a date so everytime I asked her she would make up some excuse like she was busy so I had enough and stopped talking to her so of course there I go again talking to her in Feb I asked again then again I got the sane excuse so we talked a little in March but she ended up going out with some other guy for a small amount of time so I figured I should give up on trying to get her but I was on Facebook and she messaged me calling me a jerk for not talking to her so hear I go again talking to her but this time I got her turns out she liked me a little bit in march but decided to go out with her friends cousin who didn't last long we've been together for two months and we fell in love with eachother now does this happen alot ?