Make up sex possibility

I wanna get back with my BD even though he’s got a gf. We have a new born and he’s supposed to be coming over here to see her. I fully intend to seduce him while he’s here and I’m not ashamed that I want him back. They got together during a break and while I was pregnant so I feel like he’s really still mine and there’s no reason to respect her. Who gets with a man that is expecting a child with another woman anyway?!?! I’m sure if we get a chance to sit down and talk alone, without this new girl around, he’ll see how much he actually misses me. At the very least, I feel like I need to talk to him because our relationship changed so fast and once this other girl got involved, I haven’t had the chance to have a heart to heart with him and find out what happened between us.