best friend turned boyfriend turned ex = i'm lost

So I dated this guy for eight months, after being best friends with him for two years. It was one of those things where in high school, we were friends with that underlying sexual attraction current. But, I was dating someone else and he didn't want to interfere, and I had no idea he was even interested in me in that way.
On our senior trip, we were hanging in his hotel room and he kissed me on the forehead and told me that if I was ever interested, he was always around. I decided that since I was leaving for college 3 and 1/2 hrs away, it would be bad to start things.
But over Christmas break my freshman year, we hooked up and after that were inseparable. He'd take a bus to see me every two weeks and we'd spend hours on the phone each night. When I got home for summer vacation, we spent every moment we could together, because we knew he was enlisting. Around august, he was sent to boot camp. I called his house the day he was supposed to leave and was told he'd left early that morning. No goodbyes. I also found out that he'd had a going away party the night before and I was told that he hooked up with this sixteen year old who'd liked him forever (he was twenty at the time, so gross anyway).
At that time I left for school, heartbroken, and within a week found a rebound guy, who I'm still with (13 months later), and who is really amazing to me.
Problem= about a month after he left, I found out I was pregnant. DRAMA! My boyfriend and I decided we didn't want to know who the father was. He said he loved me and wanted to believe that he was the father. Truthfully, now that my son is born, he looks a lot like my boyfriend, but I don't know if that's wishful thinking.
Now Problem= my ex (former best friend), called me from his army base and told me he loved me and never wanted to hurt me, didn't really hook up with that girl, that his drill sargent just really got in his head and convinced him he was going to die, and so to cut off everyone that he loved. He says he doesn't want to get in between my boyfriend and I, and that if I'd rather believe that my boyfriend is my son's father, then he'll stay out of our lives.
My problem is, now that he's in my head again, I realize that I still have deep feelings for him and may still love him. But, my boyfriend was there for me through the whole pregnancy and was even in the delivery room with me. He truly believes that my son is also his and if I ever left him, it would break his heart.
What should I do? Whatever I do, someone is hurt. I love both of them, but one was a rebound, the other an ex. One is the father of my child, one thinks he could be. One was there for me, and one abandoned me.
HELP!!!

Sounds like you're in a love triangle with a kid. Complicated. For me, since you're already with someone, you should just be honest with him and tell him that it's not his kid. It might turn a bit ugly but the truth will eventually come out one day and rather now than later. As for the guy who abandoned you, you'll have to be honest with him too and it might not be pretty either. You shouldn't be afraid that you'll hurt somebody. It's worse to lie to someone than to break their heart. At least for me, it is. As for what you should do with the guys, well, that depends on what happens when the truth comes out. It's a complicated situation.