Is it love

hi i have a girl friend that i think i love but sometimes i wonder about dating other girls. I her about a year ago. I sort of avioded her at the time when i met her. I travel from california to costa rica every three months because i work for for my dad. Now about six months ago she finally got in touch with me and we hit it off. But i wasnt really attracted to her, shes cute but she is over weight, im not skinny either but i usaully tend to date skinny broads or in between. anyways as we started dating i found out how really beautiful she is what i mean by that is that no one in the world has the biggest heart like hers. man she is the sweetest person on earth. she is also brilliant, man this girl can do anything. she is jack of all trades, she even schooled me on laying down tile. i mean this girl is not boring from camping, traveling, photography, cooking, etc. you name she could do it all. there are other issues that i had with her but im sort of dealing with them with the help of god, things like she fell in love with her cousin and and she is best friends with her second boyfriend. She had seven other relationships that didnt work out i i kind didnt like that either, i starting to find out that there my own insecurities. She helped me alot through church and im currenlty on the wagon. im not angel i been with many woman even prostitutes, did drugs my whole life. The last thing i want to do is judge her on past or anyone for that matter. Now the real questions is if i really love her. weve been apart for about 3 months now she is in california and i am in costa rica i get back to her in about 6 more weeks. now during this time i get the urge to see other people and i cant stop looking at other girls. what should i do. I know ill never find anyone like her, i could probabally find a better looking girl buti will never find someone who has a heart like hers, and she smart and is adventures. please help