Is he cheating? 또는 is she just a friend? ?

Well my boyfriend for about a 월 and a half now has been talking to other girls, but there is one girl I'm worried about. She always is around him, she texts him a lot and 태그 him in a lot of pictures on Facebook. Him and her both claim that they are just friends, but is that really all they are? The girl is way 더 많이 closer to his family than I am so that scares me. I even think his mama likes her better than me. He says he only loves/likes me but Is that really true?? He always spends time with me, but yet he spends time with her too. What do 당신 think??