Am I Overthinking Or........?

Okay So This Might Be Confusing But Just Bare With Me. I Have A 3 Month Old Son & Me & His Dad (I Don’t Even Wanna Call Him That 🙄 But I’ll Be Fair) Aren’t Together. This Entire Time Since WE Found Out I Was Pregnant Even Until Birth He Has Denied My Son. But He Was There When My Son Was Born, Help Me When I Pushed, Coached Me Through Labor, Wiped My Tears While I Pushed Etc Etc. The First Month Of My Son’s Life Was Spent At His House Damn Near Everyday Because He Just Wanted To Be There Oh So Bad. I Even Befriended His Girlfriend To Keep The Peace Just So He Could See My Son. Then Before My Son Turned 2 Months Everything Just Stopped. I Ask Him To Watch Him, He Would Say Yes Then Ignore Me The Day I Need Him To Watch Him. Stopped Asking To See Him, Didn’t Check Up On Him No More, Nothing. So During That Month He Was There, I Was Talking To His Girlfriend One Day & She Happened To Mention That She Hasn’t Had A Drink Or Smoked In 4 Months. My Son Was Born In September & They Got Together In April Or May. Do The Math. I Also Noticed She Kept Wearing Bigger Clothes & Slept Majority Of The Time She Was At His House Which Was Damn Near The Whole Month Of October. Keep Following Me. Last Week My Sons Dad Called Me & Asked If I Was At Home. (We Live Very Close To Each Other) So I Said Yea & He Asked If I Had Money For Him To Get On The Bus. Me Being Nice I Said Yea What’s $3 That’s Not Bad. So I Said I Got You But I Need To Get Change, He Say Ok Can I Ride With You I’m Like Ok Fine Why Not. I Pick Him Up We Get The Change & As We’re Riding Back I Say Just Out Of Pure Curiosity & Being Nice, Do You Need A Ride To The Bus Stop, & Of Course He Said Yea Cause It Was Cold Asf Outside. So As We’re Riding I Say Where You Going Anyways He Says The Mall. I Say Okay Well Our Son Needs A Clothes He’s Grown Out Of All His 0/3 Month Clothes & He Needs More Socks So Can You Get Some I Don’t Get Paid Until Next Week. He Said Of Course Text Me His Sizes. I Text Him The Sizes He Said Okay I Heard Nothing Else About The Clothes Since. 2 Nights Ago My Son Has A Fever & Is Puking Everywhere. I Text Him Like The Baby Has A Fever & Is Throwing Up. He Says What Happened, I Tell Him What Happened No Response. He Still Hasn’t Responded Either. My Son Is Fine Now But It’s Still The Principal Like Your Kid Sick & You Don’t Even Bother To Check On Him. Ok. Today A Friend Of Mine Sent Me A Post His Girlfriend Put On Snapchat. (Below) (My Friends Are Crazy ASF That’s How They Got Her Snapchat) So I Asked My Other Friend About It & She Says Maybe She Really Is Pregnant. So Now I’m Over Here Livid Because I Feel That It’s Pure Bullshit That He Doesn’t Wanna Help Me With My Son Anymore But His Girlfriend Keeps Hinting At The Fact That They Got A Kid Together. Ig I’m Just Being Bitter & If I Am Then Ig I’m Bitter. But Christ, I Just Want Some Help With My Son. I’ve Been Doing This On My Own The Whole Time. My Pockets Are Screaming Because I’ve Literally Been Doing Everything For My Son Financially. I Never Asked For Anything Until Now & He Just Brushed It Off Like It Doesn’t Matter. Ig I’m Just Overthinking. I’m Just Frustrated. I Genuinely Believe She’s Pregnant & If She Is I’m So Upset Because I Don’t Think It’s Fair That She Gets All The Support & Help & My Son Gets Nothing.