I don’t know what my next step should be?

Hey all. I really need some input. My partner and i have been together a total of 15 months. Earlier on in the relationship, he deleted his instagram. We had a break in January, however in February, we’re back talking everyday and telling each other we love each other again. Today I found out he got instagram again, which he didn’t tell me about. More so, I saw him following and talking to a girl he told me he stopped talking too when we got together. She really liked him, and they were close, and he told me they kissed before, a few years ago. Two weeks ago I asked him if he was talking to her randomly, and he said no but today I found out otherwise. He got defensive, started accusing me of stalking him, claiming that she reached out to him just last week. I feel so hurt and betrayed, he lied that he didn’t talk to her and kept it from me. He won’t have told me, which is the sad part I had to find out on my own. He said he told her about me. It still really hurts, I am so loyal to him and it hurts. I don’t know but I feel my trust is gone.

I don’t know what my next step should be?
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