Relationship

Okay. So I was dating this guy for about 6 months. Everything was going great. I was taking care of his house and his kids and all. I helped him out with everything. Well right after mothers day he gets a call from his ex girlfriend saying that she is 6 months pregnant and he is the dad. I was devastated. He pretty much dropped me for her. We have had sex since then and a lot of it. But my thing is, is that he wants to be friends and have me come around every so often kinda like he has no feelings. Should I just say bump it and let's be friends or should I never talk to him again?