Mistrustful spouse

I’m in my mid 20s and have been in a relationship with a woman for two years. We have a daughter aged seven months. I recently travelled to the Coast for business where my ex-girlfriend lives and I have not known peace since then. Now my wife is accusing me of everything including having a sexual affair with my ex, which is not true. She has gone to the extent of saying that I do not want to support our child among many other things. Whenever my phone is out of charge, she says I’m with other women when in reality, I’m doing business with other men. I feel this is too much stress for I’m only in my 20s, and I want to end the relationship even though I still want to support my child. Please advise me on how I can go about this.

{Silah}