Was I a backup plan?

My boyfriend became distant from me for weeks and stopped being active on social media along with it. He still talked to me but not as much but blamed it on stress. He went days and a whole week without talking to me. When we met up He left his phone at home and in his car and wouldn’t let me ride in his car anymore. I found out he cheated and after a week he called to tell me but it was with a girl he knew before me. He said it was nothing serious and he didn’t really want anything to do with her. He just wanted sex from her. Suddenly he has been blowing my phone up (me not answering) and has been back to being active on social media following tons of girls.

Was I a backup plan?
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