Hi Illy Snow, having been where you are & having listened to my 'then boyfriend' I can tell you exactly what it is like to abort a pregnancy & it is not the easy way out that boys/men imagine.
The fact you are already doubting you can go through with it is enough cause not to. If you have no 'medical' need to abort you will likely need a private abortion which will cost you a large amount of money alongside the emotional heartache. You will need to speak to counsellors to confirm you understand what you are doing & are happy 'YOU' have decided to go through it (NOT your BOYFRIEND/FAMILY). The memory will stay with you & you will need to disclose the information during future pregnancies as part of your 'history'.
If your boyfriend truly can't bring himself around to living with you & your baby you should talk to your local citizans advice bureau (CAB) whose details should be in your phonebook & online. They will talk you through your options such as where to seek housing, how to claim benefits/child support that you are entitled to, how to manage childcare costs/finding a job. You are not a bad person, nor a bad mum to want to raise your baby with or without the dad. There are many single mums successfully raising happy, healthy children. Best wishes, you are never truly alone.