Did i do wrong sending this to my bf ex

Derry ann

Right they have a kid together (only recently found out he did she is nearly one) and his ex is a massive bitch to me and last night his family got in a massive argument about shit loads and my boyfriend throws in that 'slag' tried it on with him.

I stormed out the house after asking him loads and he denied it (he said he didnt tell me as he didnt want me to get hurt) i went back in the house robbed his phone got her number and text her this