i need mom advice

i’m going through what i think is a breakup. i found out my “boyfriend” linked up with a girl that he cheated on me with in the beginning of the relationship and his excuse was because i wouldn’t listen to him, but my trust for him has been broken and it’s been hard to let go. it’s been 3 years.

so last night we got into a very bad argument because he came out and told me the truth because i found condoms in his bag, he left and today he is ignoring me. idk why i’ve been trying to reach out.. ik i seem so dumb i just really need the hard truth to help me let him go, idc how

mean it is. ik it’s obvious but it’s hard because of the great times we’ve had. he was my best friend at one point.