Mate u r still so young,concentrate on being the best dad you can first,it ain’t nice being with someone who humiliates you,ive been there mate and it can break you trust me,I know it’s hard all you ever want in life is a picture perfect family and unit but that’s not always the case,I would’nt want to be with someone who’s messaging someone else,u will never trust her and that will ruin your relationship if u ever get back together,if she is already messaging a new guy it will be very hard to get her back,u can’t force it,u just have to let her do her thing and give her space the more you pressure her to get back together the more u will push her away.