Should I forgive my baby’s daddy?

I’m 26 yrs old and ma life got complicated afta I gave birth to my 1st born then later found out ma fiancee have a son 15 days older than mine . Few weeks later his sister and his baby mama called me and told me to stay away from him and he started avoiding me. 3mnths later a guy I.v known 4 years came into my life and made me feel special supported me and my son and evn askd me to marry him I agreed to it but my baby father came bck and askd for forgiveness told me he.d made a mistake and that his family preasured him into leaving me. I care about him and he is still in my heart I don’t know if I shoud forgive him or continue marrying the one I’m with now. Please help ‘ogotlhe omatla , jhb’