Confused

So they other night I had so many suspicious about my boyfriend's behavior so I called his friend and asked him so then his friend said he can call my boyfriend and ask him what's wrong so he made a three-way call and I put myself on mute so then they were talking for a good minute about them and then his friend asked "so what's up with u and your girl??" and my boyfriend responded with "who??" and his friend was like "your girl" and my boyfriend said "oh yea umm we good why wassup" and then his friend said "how's ya relationship" and then my boyfriend said "Well it's really not a relationship it's just an in and out thing" and I immediately bursted into tears..I felt so hurt and he said it with no hesitation..Should I still be with him or do I need to leave him?? Tell me what u think?